Question

How to use the qsort function to sort an array of integers in C

Answer 1

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

void print(int arr[], int len) {
    for (int i = 0; i < len; i++)
        printf("%i ", arr[i]);
    printf("\n");
}

int compare_function(const void *a, const void *b) {
   return ( *(int*)a - *(int*)b );
}

int main()
{
    int arr[] = {78, 57, 120, 100, 99, 88, 12, 4};
    int len = sizeof(arr)/sizeof(int);

    qsort(arr, len, sizeof(int), compare_function);

    print(arr, len);

    return 0;
}



/*
run:

4 12 57 78 88 99 100 120

*/

 

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