/*
  libqsort.c -- demo of library qsort function
  cmc, 6/3/01
*/

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

/* comparison function for integers - to pass to qsort */
int compareInt(const void *p1, const void *p2) {
    int num1 = *(int *)p1,
        num2 = *(int *)p2;
    return num1 - num2;
}

/* utility to print integer arrays */
void pr(int a[], int n) {
    int i;
    for (i=0; i<n; i++) printf(" %d", a[i]);
    printf("\n");
}

/* simple main to call qsort */
int main() {
    int x[] = {72, 91, 4, 13, 7, 6, 50, 25, 44, 1};
    int n = 10;
    printf("before sorting:"); pr(x,n);
    
    /* invoke library qsort function */
    qsort(x, n, sizeof(int), compareInt);
    
    printf("after sorting:"); pr(x,n);
    return 0;
}