The do-while loop is a control flow statement that executes a block of code at least once, and then repeatedly executes the block, or not, depending on a given boolean condition at the end of the block.

Here is the syntax for a do-while loop in C:

 

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

 

The condition is a boolean expression that is evaluated at the end of each iteration of the loop. If the condition is true, the loop will continue to execute. If the condition is false, the loop will terminate.

Here is an example of a do-while loop that counts down from 10 to 1:

 

 

#include <stdio.h>

int main(void) {
int i = 10;
do {
printf(“%d\n”, i);
i–;
} while (i > 0);

return 0;
}

 

 

This program will print the numbers 10 through 1 on separate lines.