C Notes
- The C programming language is a general-purpose, high-level language
- that was originally developed by Dennis M. Ritchie to develop the UNIX operating system at Bell Labs.
- C was originally first implemented on the DEC PDP-11 computer in 1972.
- In 1978, Brian Kernighan and Dennis Ritchie produced the first publicly available description of C, now known as the K&R standard.
- The UNIX operating system, the C compiler, and essentially all UNIX applications programs have been written in C.
- Today's most popular Linux OS and RBDMS MySQL have been written in C
- The C has now become a widely used professional language for various reasons.
- Easy to learn
- Structured language
- It produces efficient programs.
- It can handle low-level activities.
- It can be compiled on a variety of computer platforms.
- The C Compiler
- The source code written in the source file is the human-readable source for your program. It needs to be "compiled", to turn into machine language so that your CPU can actually execute the program as per the instructions given.
- This C programming language compiler will be used to compile your source code into the final executable program.
- We assume you have basic knowledge about a programming language compiler. The most frequently used and the free available compiler is the GNU C/C++ compiler, otherwise, you can have compilers either from HP or Solaris if you have respective Operating Systems.
- The following section guides you on how to install the GNU C/C++ compiler on various OS. I'm mentioning C/C++ together because the GNU GCC compiler works for both C and C++ programming languages.
- To install GCC on Windows you need to install MinGW.
- To install MinGW, go to the MinGW homepage, www.mingw.org, and follow the link to the MinGW download page.
- Download
the latest version of the MinGW installation program, which should be named MinGW-
.exe. -
While installing MinWG, at a minimum, you must install GCC-core, GCC-g++, Binutils, and the MinGW runtime, but you may wish to install more. -
Add the bin subdirectory of your MinGW installation to your PATH environment variable, so that you can specify these tools on the command line by their simple names. - When the installation is complete, you will be able to run GCC, g++, ar, ranlib, dlltool, and several other GNU tools from the Windows command line.
-
The first line of the program #include is a preprocessor command, which tells a C compiler to include stdio.h file before going to actual compilation. -
The next line in main() is the main function where program execution begins. -
The next line /*...*/ will be ignored by the compiler and it has been put to add additional comments in the program. So such lines are called comments in the program. -
The next line printf(...) is another function available in C that causes the message "Hello, World!" to be displayed on the screen. -
The next line return 0; terminates main()function and returns the value 0.
- Let’s look at how to save the source code in a file, and how to compile and run it.
- Following are the simple steps:
- Open a text editor and add the above-mentioned code.
- Save the file as hello.c
- Open a command prompt and go to the directory where you saved the file.
- Type GCC hello.c and press enter to compile your code.
- If there are no errors in your code, the command prompt will take you to the next line and would generate a.out executable file.
- Now, type a.out to execute your program.
- You will be able to see "Hello World" printed on the screen
- A-C program consists of various tokens and a token is either a keyword, an identifier, a constant, a string literal, or a symbol. For example, the following C statement consists of five tokens:
- printf("Hello, World! \n");
- The individual tokens are:
- printf ( "Hello, World! \n" ) ;
- In the C program, the semicolon is a statement terminator. That is, each individual statement must be ended with a semicolon. It indicates the end of one logical entity.
- For example, following are two different statements:
- printf("Hello, World! \n");
- return 0;
- Comments are like helping text in your C program and they are ignored by the compiler. They start with /* and terminate with the characters */ as shown below:
- /* my first program in C */
- You cannot have comments within comments and they do not occur within a string or character literals.
- A C identifier is a name used to identify a variable, function, or any other user-defined item. An identifier starts with a letter A to Z or a to z or an underscore _ followed by zero or more letters, underscores, and digits (0 to 9).
- C does not allow punctuation characters such as @, $, and % within identifiers. C is a case-sensitive programming language. Thus, Manpower and manpower are two different identifiers in C. Here are some examples of acceptable identifiers:
- mohd zara abc move_name a_123
- myname50 _temp j a23b9 retVal
- The following list shows the reserved words in C. These reserved words may not be used as constant or variable or any other identifier names.
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- A line containing only whitespace, possibly with a comment, is known as a blank line, and a C compiler totally ignores it.
- Whitespace is the term used in C to describe blanks, tabs, newline characters, and comments. Whitespace separates one part of a statement from another and enables the compiler to identify where one element in a statement, such as an int, ends and the next element begins. Therefore, in the following statement:
- int age;
- There must be at least one whitespace character (usually a space) between int and age for the compiler to be able to distinguish them. On the other hand, in the following statement:
- fruit = apples + oranges; // get the total fruit
- No whitespace characters are necessary between fruit and =, or between = and apples, although you are free to include some if you wish for readability purposes.
C Programs
INDEX
note: click on the topic names to go to the particular topic
//my first program
1. Addition of two numbers
//addition of two no
#include <stdio.h>
#include <conio.h>
void main()
{
int a,b,c;
printf("Enter two numbers for adition");
scanf("%d %d",&a,&b);
c=a+b;
Printf("sum is :", c) ;
getch();
}
2. Substation of two numbers
//Substation of two no
#include <stdio.h>
#include <conio.h>
void main()
{
int a,b,c;
printf("Enter two numbers for substration ");
scanf("%d %d",&a,&b);
c=a-b;
Printf("substration is :", c) ;
getch();
}
3. Multiplication of two numbers
//multiplication of two no
#include <stdio.h>
#include <conio.h>
void main()
{
int a,b,c;
printf("Enter two numbers for multiplication");
scanf("%d %d",&a,&b);
c=a*b;
Printf("multiplication is :", c) ;
getch();
}
4. Division of two numbers
//division of two no
#include <stdio.h>
#include <conio.h>
void main()
{
int a,b,c;
print("Enter two numbers for division);
scanf("%d %d",&a,&b);
c=a+b;
Printf("division is :", c) ;
getch();
}
5. To find the Entered number is even or odd
// To find entered no is even or odd
#include <stdio.h>
#include <conio.h>
void main ()
{
int a[10],j,i;
clrscr();
printf("enter a number");
scanf("%d",&i);
if(i%2==0)
{
printf("Entered no is even");
}
else
printf("odd no");
getch();
}
6. To find the Entered number is Factorial
//To find the entered no's Factorial
#include <stdio.h>
#include <conio.h>
void main()
{
int i,n,c=1;
printf("enter any no to find its factoril");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
c=c*i;
}
printf("%d",c)
}
7. To find the Square of a number using a while loop
// To find a square of a number using the while loop
#include <stdio.h>
#include <conio.h>
void main()
{
int i=1,n,c;
printf("enter any no");
scanf("%d",&n);
while(i<=n)
{
c=i*n;
i++;
}
printf("%d",c);
getch();
}
8. To find the largest no in three numbers
//To find the largest no in three nos
#include <stdio.h>
#include <conio.h>
void main ()
{
int a, b, c, big;
clrscr();
printf("Enter three nos");
scanf("%d \n%d\n%d\n",&a,&b,&c);
big=a;
if(b>big)
big=b;
if(c>big)
big=c;
printf("largest no=%d",big);
getch();
}
9. Program to find Roots of Quadratic Equations
#include <math.h>
#include <stdio.h>
int main() {
double a, b, c, discriminant, root1, root2, realPart, imagPart;
printf("Enter coefficients a, b and c: ");
scanf("%lf %lf %lf", &a, &b, &c);
discriminant = b * b - 4 * a * c;
// condition for real and different roots
if (discriminant > 0) {
root1 = (-b + sqrt(discriminant)) / (2 * a);
root2 = (-b - sqrt(discriminant)) / (2 * a);
printf("root1 = %.2lf and root2 = %.2lf", root1, root2);
}
10. Condition for real and equal roots
// condition for real and equal roots
else if (discriminant == 0) {
root1 = root2 = -b / (2 * a);
printf("root1 = root2 = %.2lf;", root1);
}
// if roots are not real
else {
realPart = -b / (2 * a);
imagPart = sqrt(-discriminant) / (2 * a);
printf("root1 = %.2lf+%.2lfi and root2 = %.2f-%.2fi", realPart, imagPart, realPart, imagPart);
}
return 0;
}
11. Transposed of a Matrix
//Transposed of a Matrix
#include <stdio.h>
#include <conio.h>
void main()
{
int a[3][3],i,j,temp;
clrscr();
printf("Enter the elements of 3*3matrix");
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
scanf("%d",&a[i][j]);
}
}
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
if(i<j);
{
temp=a[i][j];
a[i][j]=a[j][i];
a[j][i]=temp;
}
}
}
printf("\ntrnspose of matrix");
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
printf("\t %d ",a[i][j]);
}
printf("\n");
}
getch();
}
12. Input short cut foe 4 by 4 matrix
// input shortcut for 4 by 4 matrix
#include <stdio.h>
#include <conio.h>
void main()
{
int a[4][4],b[4][4],i,j;
clrscr();
for(i=0;i<=3;i++)
{
for(j=0;j<=3;j++)
{
printf("Enter 12 elements");
scanf("%d",&a[i][j]);
}
}
for(i=0;i<=3;i++)
{
for(j=0;j<=3;j++)
{
printf("%d",a[i][j]);
}
}
getch();
}
13. Wap to check if a given matrix is an identtity matrix
// C to check if a given matrix is an identity matrix
#include <stdio.h>
int main (void)
{
int a[10][10];
int i = 0, j = 0, row = 0, col = 0;
printf ("Enter the order of the matrix (mxn):\n");
printf ("where m = number of rows; and\n");
printf (" n = number of columns\n");
scanf ("%d %d", &row, &col);
int flag = 0;
print ("Enter the elements of the matrix\n");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
scanf ("%d", &a[i][j]);
}
}
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
if (i == j && a[i][j] != 1)
{
flag = -1;
break;
}
else if (i != j && a[i][j] != 0)
{
flag = -1;
break;
}
}
}
if (flag == 0)
{
printf ("It is an IDENTITY MATRIX\n");
}
else
{
printf ("It is NOT an identity matrix\n");
}
return 0;
}
14. Multiple times printing pattern
// multiple times printing patterns
#include<stdio.h>
int main()
{
int i,j, k, c;
printf("enter any no");
scanf("%d",&c);
for(k=0;k<=c;k++)
{
for(i=1; i<=5; i++)
{
for(j=5; j>=i; j--)
{
printf("%d \t",j);
}
printf("\n");
}
for(i=5; i>=1; i--)
{
for(j=1; j<=i; j++)
{
printf("%d \t",j);
}
printf("\n ");
}
}
return 0;
}
15. My first program in a file
//my first program in a file
#include<stdio.h>
#include<conio.h>
void main()
{
FILE *fp;
fp=fopen("HRUSHIKESH.txt","w");
fprintf(fp, "my name is HRUSHIKESH");
fclose(fp);
getch();
}
16.Program for file name entered through keyboard
// program for file name entered through the keyboard
#include<stdio.h>
#include<conio.h>
void main()
{
FILE *fp;
char n[20];
printf("enter name of file");
scanf("%s",n);
clrscr();
fp=fopen("n","w");
fprintf(fp, "my name is HRUSHIKESH");
fclose(fp);
getch();
}
17.computer screen is he pass or fail
//To take info of 50 and marks of 3 subject from the user and to show its result on computer screen is he pass or fail
#include <stdio.h>
#include <conio.h>
void main()
{
struct student
{
char name[20];
int rno;
float m1,m2,m3;
};
struct student s[50] ;
int I;
float per;
clrscr();
for(i=0;i<=49;i++)
{
printf("Enter name of student");
gets(s[i].name);
printf("enter roll no of student");
scanf("%d",&s[i].rno);
printf("enter marks of 3 subject of student");
scanf("%f\n%f\n%f",&s[i].m1,&s[i].m2,&s[i].m3);
}
for(i=0;i<=49;i++)
{
printf("%s\n%d\n%f\n%f\n%f",s[i].name,s[i].rno,s[i].m1,s[i].m2,s[i].m3);
if(s[i].m1>=40&&s[i].m2>=40&&s[i].m3>=40)
{
per=(s[i].m1+s[i].m2+s[i].m3)/3.0;
printf("Result : Passssss");
printf("%f",per);
break;
}
else
printf("Result : fail");
}
getch();
}
18. Lower case character to upper case character
// lower case character to upper case character
#include <stdio.h>
#include<conio.h>
void main()
{
char ch;
clrscr();
printf("Enter any lower case charecter");
scanf("%c",&ch);
ch=ch-32;
printf("upper case charecter=%c",ch);
getch();
}
19. To convert lower case string to upper case
//To convert lower case string to upper case
#include <stdio.h>
#include <string.h>
int main()
{
char s[100];
int I;
printf("\nEnter a string : ");
gets(s);
for (i = 0; s[i]!='\0'; i++)
{
if(s[i] >= 'a' && s[i] <= 'z')
{
s[i] = s[i] - 32;
}
}
printf("\nString in Upper Case = %s", s);
return 0;
}
20.To find Entered character is upper case o lowere case or digit or special Symbol
// To find Entered character is upper case or lower case or digit or special symbol
#include <stdio.h>
#include <conio.h>
int main()
{
char ch;
clrscr();
printf("Ennter any character ");
scanf("%c",&ch);
if(ch>=65&&ch<=90)
{
printf("Upper case charecter");
}
if(ch>=97&&ch<=122)
{
printf("lower case charecter");
}
if(ch>=48&&ch<=57)
{
printf("Its a digit");
}
if(ch>=0&&ch<=47||ch>=58&&ch<=64||ch>=91&&ch<=96||ch>=123&&ch<=255)
{
printf("Its a spacial symbol");
}
getch();
return 0;
}
21. To find a Grade depends upon the marks out of100
//To find a Grade depends upon the marks out of 100
#include <stdio.h>
#include <conio.h>
void main ()
{
int marks;
clrscr();
printf("Enter the mmarks out of 100\n");
scanf("%d",&marks);
if(marks<=34)
{
printf("GREAD F");
}
else if(marks<=44)
{
printf("GREAD E");
}
else if(marks<=59)
{
printf("GREAD D");
}
else if(marks<=69)
{
printf("GREAD C");
}
else if(marks<=79)
{
printf("GREAD B");
}
else if(marks<=89)
{
printf("GREAD A");
}
else
{
printf("GREAD S");
}
getch();
}
22. To print numbers starts from 1 to N
// To print numbers starts from 1 to N,
N is any number
#include <stdio.h>
#include <conio.h>
void main()
{
int number, I;
printf("Enter any Number\n");
scanf("%d",&number);
printf("The number displayed are\n");
for(i=1;i<=number;i++)
{
printf("%d",i);
}
getch();
}
23. To check no is divisible by 5 or not
To check no is divisible by 5 or not
#include <stdio.h>
#include <conio.h>
void main()
{
int number, I;
printf("Enter any number");
scanf("%d",&number);
if(number%5==0)
{
printf("%d is divisible by 5 ",number);
}
else
{
printf("No is not Divisible by 5");
}
getch();
}
24. To print all even numbers present in a given range
//To print all even numbers present in a given range
#include <stdio.h>
#include <conio.h>
void main()
{
int n,i,a;
clrscr();
printf("Enter any number");
scanf("%d",&n);
printf("Even nos renging from 0 to %d are",n);
for(i=0;i<=n;i++)
{
if(i%2==0&&i!=0)
{
printf("%d"i);
}
}
getch();
}
25. simple array
//simple array
#include <stdio.h>
#include <conio.h>
main ()
{
int i, a[10],b[10], sum=0;
printf("enter 10 elements");
for(i=1;i<=9;i++)
{
scanf("%d",&a[i]) ;
}
for(i=1;i<=9;i++)
{
sum=sum+a[i];
}
printf("sum= %d",sum);
}
26. positive no
//positive no
#include <stdio.h>
#include <conio.h>
main ()
{
int i, a[10], c=0;
printf("Enter 10 elements");
for(i=0;i<=9;i++)
{
scanf("%d",&a[i]);
}
for(i=0;i<=9;i++)
{
if(a[i]>0)
{
c++;
}
}
printf("positive nos are=%d",c);
getch();
}
27. largest no
//largest no
#include <stdio.h>
#include <conio.h>
main ()
{
int i, a[10], max=0;
printf("Enter 10 elements");
for(i=0;i<=9;i++)
{
scanf("%d",&a[i]);
}
for(i=0;i<=9;i++)
{
if(max<a[i])
{
max=a[i];
}
}
printf("largest no is=%d",max);
getch();
}
28. ascending order
//ascending order
#include <stdio.h>
#include <conio.h>
main ()
{
int i, a[10],asc,t, j;
printf("Enter 10 elements");
for(i=0;i<=9;i++)
{
scanf("%d",&a[i]);
}
for(i=0;i<=9;i++)
{
for(j=0;j<=9;j++)
{
if(a[i]<a[j])
{
t=a[i];
a[i]=a[j];
a[j]=t;
}
}
}
printf("acending order=");
for(i=0;i<=9;i++)
{
printf("%d\n",a[i]);
}
getch();
}
29. descending order
//descending order
#include <stdio.h>
#include <conio.h>
main ()
{
int i, a[10],asc,t, j;
printf("Enter 10 elements");
for(i=0;i<=9;i++)
{
scanf("%d",&a[i]);
}
for(i=0;i<=9;i++)
{
for(j=0;j<=9;j++)
{
if(a[i]>a[j])
{
t=a[i];
a[i]=a[j];
a[j]=t;
}
}
}
printf("descending order=");
for(i=0;i<=9;i++)
{
printf("%d\n",a[i]);
}
getch();
}
30. even odd
//even odd
#include <stdio.h>
#include <conio.h>
main ()
{
int i, a[10],asc=0,t, j, c=0;
printf("Enter 10 elements");
for(i=0;i<=9;i++)
{
scanf("%d",&a[i]);
}
for(i=0;i<=9;i++)
{
if(a[i]%2==0)
{
c++;
}
else
{
asc++;
}
}
printf(" even%d\n",c);
printf("odd %d\n",asc);
getch();
}
31.2d array
//2d array
#include<stdio.h>
#include<conio.h>
void main()
{
int a[2][2],i,j,b[2][2],c[2][2];
clrscr();
//input
printf("Enter elemets of 2*2 matrix");
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
scanf("%d",&a[i][j]);
}
}
//output
printf("Elemets of matrix are\n");
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
printf("%d",a[i][j]);
}
}
getch();
}
32. occurrence
//occurrence
# include<stdio.h>
#include<conio.h>
void main()
{
int a[10],i,j,count=0,num;
clrscr ();
// input
printf("enter the 10 elements");
for(i=0;i<=9;i++)
{
scanf("%d",&a[i]);
}
printf("enter any no");
scanf("%d",&num);
//output
for(i=0;i<=9;i++)
{
if(a[i]==num)
{
count=count+1;
}
}
//output
printf(" it occures=%dtimes\n",count);
getch();
}
33. addition of 2d array
// addition of 2d array
#include<stdio.h>
#include<conio.h>
main()
{
int a[2][2],i,j,b[2][2],c[2][2];
clrscr();
//input
printf("Enter elemets of 2*2 matrix1\n");
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("Enter elemets of 2*2 matrix2\n");
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
scanf("%d",&b[i][j]);
}
}
//process
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
c[i][j]=a[i][j]+b[i][j];
}
}
//output
printf("Elemets of matrix are\n");
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
printf("%d",c[i][j]);
}
}
getch();
}
34. multiplication of 2d array
//multiplication of 2d array
#include<stdio.h>
#include<conio.h>
main()
{
int a[2][2],i,j,b[2][2],c[2][2],k;
clrscr();
//input
printf("Enter elemets of 2*2 matrix1\n");
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("Enter elemets of 2*2 matrix2\n");
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
scanf("%d",&b[i][j]);
}
}
//process
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
c[i][j]=0;
for(k=0;k<=1;k++)
{
c[i][j]=c[i][j]+(a[i][k]*b[k][j]);
}
}
} //output
printf("Elemets of matrix are\n");
for(i=0;i<=1;i++)
{
for(j=0;j<=1;j++)
{
printf("%d\t",c[i][j]);
}
printf("\n");
}
getch();
}
35. multiplication of 3d array
// multiplication of 3d array
#include<stdio.h>
#include<conio.h>
main()
{
int a[3][3],i,j,b[3][3],c[3][3],k;
clrscr();
//input
printf("Enter elemets of 3*3 matrix1\n");
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("Enter elemets of 3*3 matrix2\n");
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
scanf("%d",&b[i][j]);
}
}
//process
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
c[i][j]=0;
for(k=0;k<=2;k++)
{
c[i][j]=c[i][j]+(a[i][k]*b[k][j]);
}
}
} //output
printf("Elemets of matrix are\n");
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
printf("%d\t",c[i][j]);
}
printf("\n");
}
getch();
}
36. multiplication of 4d array
// multiplication of 4d array
#include<stdio.h>
#include<conio.h>
main()
{
int a[4][4],i,j,b[4][4],c[4][4],k;
clrscr();
//input
printf("Enter elemets of 4*4 matrix1\n");
for(i=0;i<=3;i++)
{
for(j=0;j<=3;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("Enter elemets of 4*4 matrix2\n");
for(i=0;i<=3;i++)
{
for(j=0;j<=3;j++)
{
scanf("%d",&b[i][j]);
}
}
//process
for(i=0;i<=3;i++)
{
for(j=0;j<=3;j++)
{
c[i][j]=0;
for(k=0;k<=3;k++)
{
c[i][j]=c[i][j]+(a[i][k]*b[k][j]);
}
}
} //output
printf("Elemets of matrix are\n");
for(i=0;i<=3;i++)
{
for(j=0;j<=3;j++)
{
printf("%d\t",c[i][j]);
}
printf("\n");
}
getch();
}
37. to check if a given matrix is an identity matrix
// C to check if a given matrix is an identity matrix
#include <stdio.h>
int main (void)
{
int a[10][10];
int i = 0, j = 0, row = 0, col = 0;
printf ("Enter the order of the matrix (mxn):\n");
printf ("where m = number of rows; and\n");
printf (" n = number of columns\n");
scanf ("%d %d", &row, &col);
int flag = 0;
printf ("Enter the elements of the matrix\n");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
scanf ("%d", &a[i][j]);
}
}
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
if (i == j && a[i][j] != 1)
{
flag = -1;
break;
}
else if (i != j && a[i][j] != 0)
{
flag = -1;
break;
}
}
}
if (flag == 0)
{
printf ("It is an IDENTITY MATRIX\n");
}
else
{
printf ("It is NOT an identity matrix\n");
}
return 0;
}
38. multiple times printing pattern
// multiple times printing patterns
#include<stdio.h>
int main()
{
int i,j, k, c;
printf("enter any no");
scanf("%d",&c);
for(k=0;k<=c;k++)
{
for(i=1; i<=5; i++)
{
for(j=5; j>=i; j--)
{
printf("%d \t",j);
}
printf("\n");
}
for(i=5; i>=1; i--)
{
for(j=1; j<=i; j++)
{
printf("%d \t",j);
}
printf("\n ");
}
}
return 0;
}
39. To take the info of 50 and marks of 3 subject from the user and to show its result on a computer screen
//To take info of 50 and marks of 3 subject from the user and to show its result on computer screen is he pass or fail
#include <stdio.h>
#include <conio.h>
void main()
{
struct student
{
char name[20];
int rno;
float m1,m2,m3;
};
struct student s[50] ;
int I;
float per;
clrscr();
for(i=0;i<=49;i++)
{
printf("Enter name of student");
gets(s[i].name);
printf("enter roll no of student");
scanf("%d",&s[i].rno);
printf("enter marks of 3 subject of student");
scanf("%f\n%f\n%f",&s[i].m1,&s[i].m2,&s[i].m3);
}
for(i=0;i<=49;i++)
{
printf("%s\n%d\n%f\n%f\n%f",s[i].name,s[i].rno,s[i].m1,s[i].m2,s[i].m3);
if(s[i].m1>=40&&s[i].m2>=40&&s[i].m3>=40)
{
per=(s[i].m1+s[i].m2+s[i].m3)/3.0;
printf("Result : Passssss");
printf("%f",per);
break;
}
else
printf("Result : fail");
}
getch();
}
40. lower case character to upper case character
// lower case character to upper case character
#include <stdio.h>
#include<conio.h>
void main()
{
char ch;
clrscr();
printf("Enter any lower case charecter");
scanf("%c",&ch);
ch=ch-32;
printf("upper case charecter=%c",ch);
getch();
}
41. To convert lower case string to upper case
//To convert lower case string to upper case
#include <stdio.h>
#include <string.h>
int main()
{
char s[100];
int I;
printf("\nEnter a string : ");
gets(s);
for (i = 0; s[i]!='\0'; i++)
{
if(s[i] >= 'a' && s[i] <= 'z')
{
s[i] = s[i] - 32;
}
}
printf("\nString in Upper Case = %s", s);
return 0;
}
42.To find Entered character is uppar case pr lower case or digit or special symbol
// To find Entered character is upper case pr lower case or digit or special symbol
#include <stdio.h>
#include <conio.h>
int main()
{
char ch;
clrscr();
printf("Ennter any character ");
scanf("%c",&ch);
if(ch>=65&&ch<=90)
{
printf("Upper case charecter");
}
if(ch>=97&&ch<=122)
{
printf("lower case charecter");
}
if(ch>=48&&ch<=57)
{
printf("Its a digit");
}
if(ch>=0&&ch<=47||ch>=58&&ch<=64||ch>=91&&ch<=96||ch>=123&&ch<=255)
{
printf("Its a spacial symbol");
}
getch();
return 0;
}
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