do while loop in C

The do while loop is a post tested loop. Using the do-while loop, we can repeat the execution of several parts of the statements. The do-while loop is mainly used in the case where we need to execute the loop at least once. The do-while loop is mostly used in menu-driven programs where the termination condition depends upon the end user.

do while loop syntax

The syntax of the C language do-while loop is given below:

do{
//code to be executed
}while(condition);

Example 1

#include<stdio.h>
#include<stdlib.h>
void main ()
{
char c;
int choice,dummy;
do{
printf("\n1. Print Hello\n2. Print Anmolknowledge\n3. Exit\n");
scanf("%d",&choice);
switch(choice)
{
case 1 :
printf("Hello");
break;
case 2:
printf("Anmolknowledge");
break;
case 3:
exit(0);
break;
default:
printf("please enter valid choice");
}
printf("do you want to enter more?");
scanf("%d",&dummy);
scanf("%c",&c);
}while(c=='y');
}

Output

1. Print Hello 

2. Print Anmolknowledge

3. Exit 

 Hello do you want to enter more? 

y 

1. Print Hello 

2. Print Anmolknowledge

3. Exit 

Anmolknowledge do you want to enter more?

 n

                                                                                                                                  

do while example


There is given the simple program of c language do while loop where we are printing the table of 1.

#include<stdio.h>
int main(){
int i=1;
do{
printf("%d \n",i);
i++;
}while(i<=10);
return 0;
}

Output

1

2 

3 

4 

5 

6 

7 

8 

9 

10