#include<stdio.h>

#define Operations(x) operation_ ## x  // ## 是黏贴字符串

int Operations(sum)(int x,int y){  // operation_sum(int x,int y)

    return x+y;

}

int Operations(sub)(int x,int y){  // operation_sub(int x,int y)

    return x-y;

}

int Operations(mul)(int x,int y){  // operation_mul(int x,int y)

    return x*y;

}

float Operations(div)(float x,float y){  // operation_div(int x,int y)

    float result;

    result =x/y;

    return result;

}

#define Print(x) printf("%s,%d\n",#x,x);  // # 表示将参数转变为字符串

int main()

{

    int x;

    float y;

    x=Operations(sum)(,);

    printf("x=%d\n",x);

    x=operation_sum(,);

    printf("x=%d\n",x);

    x=Operations(sub)(,);  // operation_sub(10,20)也可以

    printf("x=%d\n",x);

    x=Operations(mul)(,);  // operation_mul(10,20)也可以

    printf("x=%d\n",x);

    y=Operations(div)(,);  // operation_div(11,20)也可以

    printf("y=%lf\n",y);

    Print();

    return ;

}