1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
void print_int_array(int const* array, int size) {
printf("[");
for(int i = 0; i < size; i++) {
printf("%d, ", array[i]);
}
printf("]\n");
}
int compare_integers(const void* a_left, const void* a_right) {
// impossible: type(a_left) == int
// you can do this in one line
// but doing it over multiple can reduce errors
const int* a_left_int = a_left;
const int* a_right_int = a_right;
int left_int = *a_left_int;
int right_int = *a_right_int;
if (left_int < right_int) {
return -1; // left is less than right
}
if (left_int == right_int) {
return 0;
}
assert(left_int > right_int);
return 1;
}
int main(int argc, char* argv[]) {
int array [5] = { 5, 2, 3, 1, 4 }; // unsorted array
print_int_array(array, 5);
qsort(array, 5, sizeof(array[0]), compare_integers);
print_int_array(array, 5);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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