Do While Loop in C

By: Unknown on 11:27

C Programming

The last of the three loops in C is the Do While loop, which is very similar to the While loop-the difference is that in the do loop the test condition is evaluated after the loop is executed rather than before. Here is the program which prints the numbers from 0 to 9.

Program

void main ( )

{

int num=0; //initialization

do 

{

printf("Number is %d\n",num); // statements to be repeated

num++; // increment

}

while(num<10) // test

}

Output

Number is 0

Number is 1

Number is 2

Number is 3

Number is 4

Number is 5

Number is 6

Number is 7

Number is 8

Number is 9

The do loop, unlike the other loops, has two keywords: do and while. The do keyword marks the beginning of the loop; the while keyword marks the end of the loop 

in do loop, the body of the loop is first executed, the n the test condition is checked. if the test condition is true, the loop is repeated, if it is false , the loop terminates. the important point is that the body of the loop will execute at least once.