p5_10.cpp

相当丰富的C++源码

/*******************************
* p5_10.cpp                     *
* 菜单程序                      *
********************************/
#include <iostream>
using namespace std; 
int add(int a,int b) {
	return a+b;
}
int sub(int a,int b) {
	return a-b;
}
int mul(int a,int b) {
	return a*b;
}
int divi(int a,int b) {
	if (b==0) return 0x7fffffff;
	else return a/b;
}
int (*menu[])(int a,int b)={add,sub,mul,divi};
void main() {
	int num1,num2,choice;
	cout<<"Select operator:"<<endl;
	cout<<"      1: add"<<endl;
	cout<<"      2: sub"<<endl;
	cout<<"      3: multiply"<<endl;
	cout<<"      4: divide"<<endl;
	cin>>choice;
    cout<<"Input number(a,b): ";
	cin>>num1>>num2;
	cout<<"Result:"<<menu[choice-1](num1,num2)<<endl;  
}