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iOS

Posted by Rodrigo Chousal
Rodrigo Chousal
16,009 Points

How many times will the following loop execute?

int i = 1;
do {
printf("looping");
}
while ( i < 1 ) ;

Wouldn't this be zero?

1 Answer

Pol Martin
Pol Martin
8,200 Points

Hi Rodrigo, the loop will execute one single time.

The DO WHILE loop will execute always at least once. That's because it first executes the block of code and evaluates the condition in the "while" part after, deciding then if it must loop again or not.

It would be zero if you used a WHILE loop instead of the DO WHILE so it would evaluate the condition before executing any of the inner code.

Here's a graphical representation for better understanding:

Loops