You have the control code %d in your printf statements, which is a placeholder for an int. As Sourcecode just said, you need to initialize your variables too... try this... *feeling generous*
Code:
#include <stdio.h>
int main ()
{
/*declares variables*/
int begin_num=0;
int bn=0;
int stop_num=0;
int increment_num=0;
/*prompt the user for input*/
printf ("Please enter a number to begin counting from:");
scanf ("%d",&bn);
printf ("\n Please enter a number to stop counting:");
scanf ("%d",&stop_num);
printf ("\n Please enter the increment number:");
scanf ("%d",&increment_num);
/*the for_loop*/
for (begin_num =bn;begin_num <=stop_num;begin_num+=increment_num)
printf ("\n%d",begin_num);
}
oh, and use code tags...