Sorting Arrays with qsort in C
This source shows how to use the stdlib.h function qsort to order values in an array from least to greatest.
qsortDemo.c
#include <stdio.h>
#include <stdlib.h>
int comparisonFn(const void *p1, const void *p2);
int main(void) {
int ourArray[] = {23,0,-1,3,3288,-27};
printf("original array:\n");
for (int i = 0; i < 6; i++){
printf("[%d]: %d\n", i, ourArray[i]);
}
printf("sorted array:\n");
qsort(ourArray, 6, sizeof(int), comparisonFn);
for (int i = 0; i < 6; i++){
printf("[%d]: %d\n", i, ourArray[i]);
}
return 0;
}
int comparisonFn(const void *p1, const void *p2){
int value1 = *(int*)p1;
int value2 = *(int*)p2;
return value1 - value2;
}