for loop

تفضل :

#include <stdio.h>

int old_num, current_num, next_num;

int main(void)
{
	old_num, current_num = 1;

	printf("1 ");
	while ( current_num < 22 )
	{
		 printf("%d ", current_num);
		 next_num = current_num + old_num;
		 old_num = current_num;
		 current_num = next_num;

	}
	return 0;
}