Click here to download minmax.c.

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

void minmax(int* minptr, int* maxptr, 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
  int min, max;
  minmax(&min, &max, data, n);
  // AND PRINT OUT THE RESULTS
  printf("The min is %i and the max is %i.\n", min, max);

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

// finds the smallest and largest values in the given array
// and stores them in the integers pointed to by the first
// two arguments
void minmax(int* minptr, int* maxptr, int* array, int size) {
  // start with both equaling the first array element
  *minptr = array[0];
  *maxptr = array[0];

  // go through the rest of the array and update as necessary
  for (int i=1; i < size; ++i) {
    if (array[i] < *minptr) {
      *minptr = array[i];
    } else if (array[i] > *maxptr) {
      *maxptr = array[i];
    }
  }
}