函数指针的简单用法

#include <studio.h>

// compare function
int jug(int x, int y)
{
    if(x >= 0) return x;
    else if(y == 0) return x;
    else return x/y;             
}

// get sum
int sub(int x, int y)
{
    return x+y;   
}

// get sub
int minus(int x, int y)
{
    return x-y;   
}

void test(int (*p)(int, int), int a, int b)
{
    int Int1;
    Int1 = (*p)(a,b);
    printf("a=%d, b=%d,  %d\n", a, b, Int1);   
}

int main()
{
    int a = 1, b = 2, c = 3, d = 4, e = 5;
    test(sub, a, b);
    test(minus, c, d);
    test(jug, e, b);
    return 0;
}