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| #include<iostream>
#include <string>
#include<stdlib.h>
#include<stdio.h>
using namespace std;
float triangle(float &x, float &y) {
return x * y * 0.5;
}
float rectangle(float &x, float &y) {
return x * y;
}
void swap(float &x, float &y) {
float n;
n = x;
x = y;
y = n;
}
void print(float &x, float &y) {
cout << "长为：" << x << "宽为：" << y << endl;
}
bool check(string str) {
for (int i = 0; i < str.length(); i++) {
if ((str[i] > '9' || str[i] < '0') && (str[i] != '.')) {
return false;
}
}
return true;
}
void get(float &x, float &y) {
cout << "请输入x的值：";
string str1;
cin >> str1;
while (!check(str1)) {
cout << "输入的不是数字，请重新输入！！！" << endl;
cin >> str1;
}
x = atof(str1.c_str());
cout << "请输入y的值：";
string str2;
cin >> str2;
while (!check(str2)) {
cout << "输入的不是数字，请重新输入！！！" << endl;
cin >> str2;
}
y = atof(str2.c_str());
}
int main() {
bool quit = false;
float a = 2, b = 3;
int choice;
while (quit == false) {
cout << "(0)退出(1)设置长宽(2)三角形(3)退长方形(4)交换长宽：";
cin >> choice;
switch (choice) {
case 1:
cout << "设置前长和宽的值：";
print(a, b);
get(a, b);
cout << "设置后长和宽的值：";
print(a, b);
break;
case 2:
cout << "三角形的面积为：" << triangle(a, b) << endl;
break;
case 3:
cout << "长方形的面积为：" << rectangle(a, b) << endl;
break;
case 4:
cout << "交换前长和宽的值：";
print(a, b);
swap(a, b);
cout << "交换后长和宽的值：";
print(a, b);
break;
default:
quit=true;
break;
}
}
return 0;
}
|