The do-while loop in c in an exit controlled loop unlike the for and the while loop the condition is checked at the end of the loop(i.e, after the execution of all the statements inside the do-while block), therefore the do-while loop runs at least once in the program even if the condition fails.

syntax:

do
{
  //statements to be executed
}while(condtion);

Flowchart of the do-while loop:

The do-while loop in c is used in cases where we need to ensure that the statements within the loop are executed at least once.

Example:

#include <stdio.h>

int main() {
  do
  {
      printf("coderzpy.com");
  }while(4<1);
   
    return 0;
}

output:

coderzpy.com

In the above example, even though the condition is false, we get the output as coderzpy.com once.

Note: break and continue statements are used with the do-while as well as the while loop. We shall see further about them in the next post.

Infinite loop with the do-while

The do..while loop can also be used to create the infinite loop. The following is the syntax to create the infinite do..while loop.

do  
{  
    // body of the loop..  
}while(1);  

As we can see the condition will always remain true in the above code, therefore it is an infinite loop.

Note: also read about while loop in c & while loop examples in c

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