问大家各关于函数指针转化的问题

syiaedonghui

// test_function_pointer4.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "stdio.h"

typedef int ( *FPInt)(int a,int b);
typedef int ( *FPDouble)(double a,double b);

int Compare_int(int a,int b);
int CompareAll(double a,double b,FPDouble fpDouble);

int main(int argc, char* argv[])
{
        int a,b;
        a = 1;
        b = 2;
        CompareAll(a,b,(FPDouble)Compare_int);
        return 0;
}

int Compare_int(int a,int b)
{
        printf("compare int!\n");
        printf("a = %d,b = %d\n",a,b);
        return NULL;
}

int CompareAll(double a,double b,FPDouble fpDouble)
{
        printf("a = %d,b = %d\n",a,b);
        fpDouble(a,b);
        return NULL;
}


结果为
a = 0,b= 1072693248
compare int
a = 0,b= 1072693248
不为什么不为1呢，谢谢了

syiaedonghui

o.明白了，谢谢你的答复。