Thread: for loops - noob question

Could any help me through the flow of this loop? I understand the syntax, but I am trying to figure out the flow of the for loop and why it prints how it prints.

The output starts as:
0
1
1
2
3
5
...

why in the loop does it print zero, then two sets of 1's. When I try and follow the loop, I figure it to start 0 for the initial then 1,2...

Thanks

Code:

#include <stdio.h>;

int main (void)
{
	

int firstval = 0;
int secondval = 1;
int tempvalue, count = 15;

for (count = 1; count <= 15; count++)
{
	tempvalue = firstval + secondval;

	printf("%d\n", firstval);
	firstval = secondval;
	secondval = tempvalue;	


	}


	getchar();
	return 0;

}

Just follow the values of your variables... write them down for several times around the loop... step by step... you'll see what it's doing.

I see, I got it. thanks.

Originally Posted by teelnaw

I see, I got it. thanks.

You're welcome.

One of the most important things for a programmer to learn is troubleshooting... how to analyse a situtation that's gone wrong.

FYI :

Another part of programming is recognizing common sequences which show up in toy homework problems (and eventually toy interview questions) : Fibonacci number - Wikipedia, the free encyclopedia.

This also shows up if you do a google search for 0 1 1 2 3 5. That's useful for finding hints about other sequences (but in my experience more complex sequences just get matched up to phone numbers so it's not always going to help).

Don't put a semicolon after a preprocessor.