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:

1. do{  
2. //code to be executed  
3. }while(condition); 

Example 1

1. #include<stdio.h>  
2. #include<stdlib.h>  
3. void main ()  
4. {  
5.     char c;  
6.     int choice,dummy;    
7.     do{  
8.     printf("\n1. Print Hello\n2. Print Javatpoint\n3. Exit\n");  
9.     scanf("%d",&choice);  
10.     switch(choice)  
11.     {  
12.         case 1 :   
13.         printf("Hello");   
14.         break;  
15.         case 2:    
16.         printf("Javatpoint");  
17.         break;  
18.         case 3:  
19.         exit(0);   
20.         break;  
21.         default:   
22.         printf("please enter valid choice");      
23.     }  
24.     printf("do you want to enter more?");   
25.     scanf("%d",&dummy);  
26.     scanf("%c",&c);  
27.     }while(c=='y');  
28. }  

Output

1. Print Hello
2. Print Javatpoint
3. Exit
1
Hello
do you want to enter more?
y

1. Print Hello
2. Print Javatpoint
3. Exit
2
Javatpoint
do you want to enter more?
n