Click here to download diffs.c.

#include <stdio.h>
#include <stdlib.h>

void diffs(int* array, int size);

int main() {
  // read size n
  int n;
  do {
    printf("Enter size: ");
    fflush(stdout);
  } while(scanf(" %i", &n) != 1 || n <= 0);

  // allocate array and read in contents
  int* data = calloc(n, sizeof(int));
  printf("Enter %i integers, space separated.\n", n);
  for (int i=0; i<n; ++i) {
    scanf(" %i", &data[i]);
  }

  // CALL YOUR FUNCTION(S) HERE
  // AND PRINT OUT THE RESULTS
  diffs(data, n);

  // clean-up time
  free(data);
  return 0;
}

void diffs(int* array, int size) {
  // start with index 1, and compare to the previous index
  // at each step
  for (int i=1; i < size; ++i) {
    printf("%i", array[i] - array[i-1]);
    if (i == size - 1) {
      printf("\n");
    } else {
      printf(" ");
    }
  }
}