What is the purpose of a do-while loop?

Question

I know what do does, and how it cooperates with the while loop, but won\'t a while loop code be the same, whether or not the do is there?

Answer 1

Consider the following:

while(condition){
   myFunction();
}

and

do{
   myFunction();
}while(condition);

The second form executes myFunction() at least once then checks the condition! To do so with a while loop you've to write:

myFunction();

while(condition){
   myFunction();
}