W3School TIY Editor

#include <stdio.h> #include <stdlib.h> int compare(const void *a, const void *b) { return (*(int*)a - *(int*)b); } int main() { int numbers[] = { 5, 2, 9, 1, 7 }; int size = sizeof(numbers) / sizeof(numbers[0]); qsort(numbers, size, sizeof(int), compare); for (int i = 0; i < size; i++) { printf("%d ", numbers[i]); } return 0; }