编程问题？

更新时间2019-01-15 23:01:15

#include<iostream>

#include<iomanip>

#include<math.h>

#include<string>

using namespace std;

enum level{e,f,g,h};

const double PI=3.1415926;

int main()

{

int a;

int z;

int v;

int c;

int b;

unsigned int x;

unsigned int y;

string r;

string e;

string d;

string str1="男",str2="女";

cout<<"这是一些数学运算 ";

cout<<"a=";

cin>>a;

cout<<"b=";

cin>>b;

cout<<"a+b= "<<a+b<<endl;

cout<<"a*b= "<<a*b<<endl;

cout<<"a/b= "<<(float)a/b<<endl;

cout<<"b/a= "<<(float)b/a<<endl;

cout<<"a-b= "<<a-b<<endl;

cout<<"b-a= "<<b-a<<endl;

cout<<"a^b= "<<(a^b)<<endl;

cout<<"a&b= "<<(a&b)<<endl;

cout<<"a|b= "<<(a|b)<<endl;

cout<<"a的b次方="<<pow(a,b)<<endl;

cout<<"b的a次方="<<pow(b,a)<<endl;

cout<<"半径为"<<a<<"的圆的面积为: "<<a*a*PI<<endl;

    cout<<"半径为"<<b<<"的圆的面积为: "<<b*b*PI<<endl;

cout<<"a的八进制为"<<setbase(8)<<a<<endl;

cout<<"a的十六进制为"<<setbase(16)<<a<<endl;

cout<<"b的八进制为"<<setbase(8)<<b<<endl;

cout<<"b的十六进制为"<<setbase(16)<<b<<endl;

    cout<<"半径为"<<a<<"的圆的周长为: "<<a*2*PI<<endl;

    cout<<"半径为"<<b<<"的圆的周长为: "<<b*2*PI<<endl;

cout<<"输入你的学期末成绩"<<endl;

cin>>x;

   if (500<x&&x<=600)

{cout<<"不错"<<endl;r="聪明";z=2;}

else if (400<x&&x<=500)

{cout<<"看得过去"<<endl;r="一般";z=2;}

else if (0<=x&&x<=300)

{cout<<"太差"<<endl;r="笨";z=2;}

else if (600<x&&x<=810)

{cout<<"棒极了！"<<endl;r="高智商";z=2;}

else 

{cout<<"YOU MUST BE KIDDING!"<<endl;r="...";z=1;}

cout<<"你多大了?"<<endl;

cin>>y;

if (0<y&&y<=10)

{cout<<"你是个小盆友"<<endl;e="很小";v=2;}

else if (10<y&&y<=20)

{cout<<"你是个年轻人"<<endl;e="年轻";v=2;}

else if (20<y&&y<=50)

{cout<<"你是个成年人"<<endl;e="中年";v=2;}

else if (50<y&&y<=120)

{cout<<"你是个老年人"<<endl;e="年迈";v=2;}

else if (y>120)

{cout<<"你是个老妖怪"<<endl;e="前所未有";v=2;}

    else 

{cout<<"..."<<endl;e="...";v=1;}

cout<<"你是男生或女生?(你最好输入“男”或“女”)"<<endl;

   if (cin>>str1)

{cout<<"emmm"<<endl;d="男生";c=2;}

else if (cin>>str2)

    {cout<<"emmm"<<endl;d="女生";c=2;}

else 

    {cout<<"..."<<endl;d="...";c=1;}

cout<<"你是一个"<<e<<"的"<<r<<d<<endl;

cout<<c<<z<<v;

return 0;

}

为什么zcv的值一直不变？？？

会变的,只是你输入的条件不对而已,如以下的

但程序是有问题

因为

if (cin>>str1)

条件始终成立的(你没有判男生/女生)

你没定义zcv