Try this...
#include <stdio.h>
int i, maxi, inci;
main()
{
printf ("Please give a starting value for i: \n");
scanf ("%d", &i);
printf ("Now enter a starting value for maxi: \n");
scanf ("%d", &maxi);
printf ("Finally, a value to increment i by: \n");
scanf ("%d", &inci);
while (i <= maxi)...