函数指针

#include <iostream>

using namespace std;

int jh(const void* a, const void* b)
{
    int i = *((int*)a);//类型转换
    int j = *((int*)b);

    cout << "jh被调用" << endl;

    return i - j;
}


int main(void)
{
    int k = 10, b = 20;
    int a[5] = { 7,2,5,3,6 };

    int(*fp)(const void*, const void*);//创建函数指针

    fp = &jh;
    //fp(&A, &b);调用
    (*fp)(&k, &b);
    
    qsort(a, sizeof(a) / sizeof(int), sizeof(int), &jh);//排序

    for (int i = 0; i < 5; i++)
    {
        cout << a[i] << endl;
    }

    return 0;
}