Thread: Need help with "while" statement

Using two types of loops (for and while) the program is supposed to count from 1 to 5, but I cannot get the while statement to work.

Code:

#include <stdio.h>
 int main (void) 
{    
 unsigned int i;
 
     printf ("This program counts from 1 to 5.\n");
     printf ("Using a for loop:\n");

for (i=1; i <= 5, ++ 1) {
    printf ( "%u...", i);
}
    printf ("\n");
    printf ("Using a while loop:\n");

while ( i <= 5) {
    printf ("%u...", i);
    ++ 1;
}

    printf ("done.\n");

}

For starters, this code shouldn't even compile, as it appears you're using '1' instead of 'i' in a few places.

Hint: Try printing the value of 'i' after the "for()" loop and before the "while()" loop.

Oh, I actually typed the wrong thing in those areas. The actual code has ++i instead.

You should copy/paste your code as it is, so people don't waste time tracking down typos that aren't actually in the code (no big deal this time, though).

Did you try printing the value of "i" between the loops?

I dont understand your hint.

Sorry about that. I couldnt figure out how to copy and paste for some reason it wouldnt let me so I had to retype it. I am very new at writing programs so please bear with me.

That's okay, as I mentioned, no big deal.

You're already printing the value of 'i' within each loop. Now try printing the value of 'i' between the loops (that is, after the "for()" loop ends and before the "while()" loop starts).

That didnt work. It printed a 6 before done.

That wasn't meant to fix it - it was meant to show you the problem.

The "for()" loop ends when "i <= 5" is no longer true. Since the "for()" loop increments 'i' each time, then "i <= 5" becomes false when 'i' becomes 6.

'i' is still 6 when it gets to the "while()" loop. As a result, "while ( i <= 5)" is false right away, meaning the code within that second loop is never executed.

So how do you think you would fix this?

Ok! maybe a return 0;

It's the value of 'i' that is causing your problem. "return 0;" would have no effect on the value of 'i'.

so I need to make sure the value is 1 again right?

Try it out and see what happens!

Ok I put i=1 before the while statement and it worked!! Thanks!

Now if i can just get the next program...