LearnCCpp/practice/lc_functionPointers.c

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

void someFunction(int arg)
{
    printf("This is someFunction being called and arg is: %d\n", arg);
    printf("Now, leaving the funciton!\n");
}

int compare(const void* left, const void* right)
{
    return (*(int*)right - *(int*)left);
}

int main()
{
    void (*pf)(int);
    pf = &someFunction;
    printf("We are about to call someFunction() using a pointer!\n");
    (pf)(5);
    printf("Wow that was cool!");

    int (*cmp)(const void*, const void*);
    cmp = &compare;

    int iarray[] = {1,2,3,4,7,5,6,9,8};
    qsort(iarray, sizeof(iarray) / sizeof(*iarray), sizeof(*iarray), cmp);

    int c = 0;
    while (c < sizeof(iarray) / sizeof(*iarray))
    {
        printf("%d\t", iarray[c]);
        c++;
    }

    return 0;
}