do while loop in C

do while loop in C

• We can use do-while loop to execute a part of program or code several times in C language. 
• The code given between the do and while block will be executed until condition is true.
• In do while loop, statement is given before the condition, so statement or code will be executed at lease one time. In other words, we can say it is executed 1 or more times.
• It is better if you have to execute the code at least once.

do while loop syntax

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

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

Flowchart of do while loop

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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>    

#include <conio.h>    

void main(){    

int i=1;  

clrscr();    

  

do{  

printf("%d \n",i);  

i++;  

}while(i<=10);  

    

getch();    

}    

Output

1

2

3

4

5

6

7

8

9

10

Program to print table for the given number using do while loop

1. #include <stdio.h>    
2. #include <conio.h>    
3. void main(){    
4. int i=1,number=0;  
5. clrscr();    
6. printf("Enter a number: ");  
7. scanf("%d",&number);    
8. do{  
9. printf("%d \n",(number*i));  
10. i++;  
11. }while(i<=10);      
12. getch();    
13. }    

Output

Enter a number: 5

5

10

15

20

25

30

35

40

45

50

Enter a number: 10

10

20

30

40

50

60

70

80

90

100

Infinitive do while loop

• If you pass 1 as a expression in do while loop, it will run infinite number of times.

1. do{  
2. //statement  
3. }while(1);