robot step sizes

hi again. i have a question on how to get my program to work. my program is to see how many steps a robot can take to get to a certain distance. the user inputs 3 step sizes and the distance. then, my program states how many possible ways the robot can travel the distance. for example, distance is 7. step sizes are 2,3,5. there are 5 possible ways to cover the distance (2+2+3,2+3+2,3+2+2,2+5,5+2).
now my question is how can i fix my recursive functions to work. how can i get the values of the step sizes into the recursive function. here is the code...

Code:

#include <stdio.h>

int steps(int dist);

main()
{
  int a,b,c,d,e;

  do
    {
      printf("Input small step: ");
      scanf("%d", &a);
      printf("Input medium step: ");
      scanf("%d", &b);
      printf("Input large step: ");
      scanf("%d", &c);

      if(a<=0||b<=0||c<=0||a>=b||a>=c||b>=c)
        printf("\nIllegal input! Please enter value again!\n\n");
    }
  while (a>=b||a>=c||b>=c||a<=0||b<=0||c<=0);


  do
    {
      printf("Input total distance to travel: ");
      scanf("%d", &d);
    }
  while (d<=0);

  printf("\nNumber of ways the robot can make the trip: %d\n", steps(d));
}

int steps(int dist)
{
  if(dist <= 2)
    return dist;
  return steps(dist-a) + steps(dist-b) + steps(dist-c);
}

that's a huge if statement. Try using switch()

nothing wrong with that if statement.

Code:

  do
    {
      printf("Input total distance to travel: ");
      scanf("%d", &d);
    }
  while (d<=0);

you rewrite over d until the last time that is what will mess you up. Once you fix that you could go through the array of d's until '\0'