I still can't get it to work. This is where I am at. Thanks everyone.
Code:
#include <stdio.h>


int insert (float x, int p, int n, int d, int q)//
{
	return (x + p + (5*n) + (10*d) + (25*q))/100;
}
int remove (float x, int p, int n, int d, int q)//
{
	return (x - p - (5*n) - (10*d) - (25*q))/100;
}
int display (int p, int n, int d, int q, float x)//
{
	return printf("p = %d\n", p);
		   printf("n = %d\n", n);
		   printf("d = %d\n", d);
		   printf("q = %d\n", q);
		   printf("x = %f\n", x);
}


int main(void)
  {   
  int pennies, nickels, dimes, quarters, p,n,d,q;
  pennies=0;
  nickels=0;
  dimes=0;
  quarters=0;
  float x = 0;


printf( " %d pennies + %d nickels + %d dimes + %d quarters = $%d\n", pennies, nickels, dimes, quarters, x);
printf("insert");
scanf("%d%d%d%d", &p, &n, &d, &q);
insert(pennies, nickels, dimes, quarters, x);
display(pennies, nickels, dimes, quarters, x);
		
printf("remove");
scanf("%d%d%d%d", &p, &n, &d, &q);
remove(pennies, nickels, dimes, quarters, x);
display (pennies, nickels, dimes, quarters, x);


return 0;
 }