C / C++ / MFC

for(int nLoop = 0; nLoop < 10; nLoop++)
{
    // Do something ten times
}

int x = 0;
while(x < 10)
{
  x++;
}

1. for
   
2. while
   
3. do-while
   

1. for: The for loop is mainly used to step through something, like an array. It syntax is "for( staring index ; condition ; increment ) Statement" These statements can be incremented (or decremented) by a known value, like 1, 3, 5, 56, ... You don't need all the items within the paranthesis, but you do need the semi-colons. Example:
   for( x = 0; x < 10; x++ ) a[x] = x;
   for( ;; )...
   Here I have an endless loop.
   for( ; x < 10; ) ...
   Here it is like the while loop.
   
2. while The while loop is used to do looping until a condition is met. One example for the while would be in polling something. You continue waiting until the event occurs then drop out of the loop. You can interchange the for/while exactly like one of the post stated. The condition testing is done at the beginning of the loop.
   
3. do-while This loop structure is a different animal than the rest. Unlike the for/while loops where they must first pass the condition to execute, the do-while will always execute the loop once. The condition testing is done at the end of the loop instead of the beginning.