C++: When to use For Loop & While Loop?

[DangerousPirate]

Hi, I have just started implementing loops into my programs. Therefore I am wondering if someone can provide me examples of perfect situations of when to use For Loops and when to use While Loops, thank you.

[Athar]

You use a loop whenever you want to repeat something. for loops when you need to count or keep track of something between iterations, while otherwise.

[vlad from moscow]

For example,

while loop:

size_t strlen( const char *s )
{
   size_t len = 0;

   while ( *s++ ) len++;

   return ( len );
}

for loop:

int a[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

for ( int i = 0; i < 10; i++ ) std::cout << a[i] << ' ';
std::cout << std::endl;

Very often there is no difference between using while loop or for loop, and even compilers generate the same code for this two kind of loops.

Try to rewrite my example with opposite kind of llop.