Question

#include <iostream>
#include <string>
#include <sstream>
#include <unistd.h>
using namespace std;

int main()
{   
    int score;
    string name, sco;
    cout<<"Hello! I am Mrs. Marian! I am the administratress of this humble website!"<<'\n';
    cout<<"This website is kindly brought to you by our Prime Minister Candry Veneroth."<<'\n';
    cout<<"This is the 'National School Grading System', or the NSGS, to help you see if your student fails or not."<<'\n';
    cout<<"The first thing you have to do is type the student's name: "<<'\n';
    getline(cin,name);
    cout<<"Great! Now please enter "<<name<<"'s correct answers in the National Education Test: ";
    getline(cin,sco);
    stringstream(sco)>>score;
    cout<<"The NET (National Education Test) has a total score of 180 with 150 questions with each question having a score of 1.2"<<'\n';
    cout<<"Loading data"<<'\n';

    if (score*1.2<90, score*1.2>=0)
    {
        cout<<"The student "<<name<<" has NOT PASSED, with a score of "<<score*1.2<<". I am sorry, and hope the best for next time.";
    }
    else if (score*1.2<180, score*1.2>=90)
    {
        cout<<"CONGRATULATIONS!"<<'\n'<<"The student "<<name<<" has PASSED, with a score of "<<score*1.2<<". Once again, congratulations!";
    }
    else if (score*1.2==180)
    {
        cout<<"CONGRATULATIONS!!!"<<'\n'<<"The student "<<name<<" has PASSED with a perfect score of "<<score*1.2<<". You will have a bright future ahead of you, "<<name<<". And I hope you for a bright future";
    }
    else if (score*1.2>180, score*1.2<0)
    {
        cout<<"This is invalid, and entering an invalid score in the NSGS is considered an act of malice against the students of Lantreind and is illegal according to the National Education Test Act (NETA) verse 5:";
        cout<<'\n'<<"'For thee who dare to destroy a student's scores, shall be convicted in the name of the Veneroth name.'"<<'\n'<<"You have been warned.";
    }
}

好的，我！我是新手！练习'if else'功能..我希望能够这样做：

如果分数为0-89，则不会通过。
如果分数为90-179，则通过。
如果分数是180，他们会以完美的分数通过！耶！
如果分数低于0或高于180，我希望程序告诉他们做得对。

我一直在修改代码，起初，第一个和第二个'if和if else（s）'没有'逗号后的代码'。所以，即使得分是180或-897或1131，它仍然会说他们（通过/不通过），完全忽略第3和第4'如果别的话。'

哦！而且，我想“暂停（1）”显而易见，为什么我把#include，但它不起作用！消息是=

错误：函数'int pause（）'
的参数太多

我真的不知道如何解决这个问题，我希望任何人都可以帮我弄清楚出了什么问题以及如何解决它并让它按照预期的方式进行。

谢谢！

此致 Crunch Gum

Answer 1

如果只有在两个条件均为真的情况下才能使结果为真，请使用&&运算符。
你不会需要最后一个条件，因为以前的条件并没有抓住所有的＆＃34;得分。
您应该使用变量来避免多次执行相同的计算。
注意浮点aritimetic中的错误。我认为如果可以，你应该避免使用浮点值。

可能的解决方法：

#include <iostream>
#include <string>
#include <sstream>
#include <unistd.h>
using namespace std;

int main()
{

    int score;
    string name, sco;
    cout<<"Hello! I am Mrs. Marian! I am the administratress of this humble website!"<<'\n';
    cout<<"This website is kindly brought to you by our Prime Minister Candry Veneroth."<<'\n';
    cout<<"This is the 'National School Grading System', or the NSGS, to help you see if your student fails or not."<<'\n';
    cout<<"The first thing you have to do is type the student's name: "<<'\n';
    getline(cin,name);
    cout<<"Great! Now please enter "<<name<<"'s correct answers in the National Education Test: ";
    getline(cin,sco);
    stringstream(sco)>>score;
    cout<<"The NET (National Education Test) has a total score of 180 with 150 questions with each question having a score of 1.2"<<'\n';
    cout<<"Loading data"<<'\n';

    int mscore = score * 12;

    if (mscore<900 && mscore>=0)
        {
            cout<<"The student "<<name<<" has NOT PASSED, with a score of "<<score*1.2<<". I am sorry, and hope the best for next time.";
        }
    else if (mscore<1800 && mscore>=900)
        {
            cout<<"CONGRATULATIONS!"<<'\n'<<"The student "<<name<<" has PASSED, with a score of "<<score*1.2<<". Once again, congratulations!";
        }
    else if (mscore==1800)
        {
            cout<<"CONGRATULATIONS!!!"<<'\n'<<"The student "<<name<<" has PASSED with a perfect score of "<<score*1.2<<". You will have a bright future ahead of you, "<<name<<". And I hope you for a bright future";
        }
    else
        {
            cout<<"This is invalid, and entering an invalid score in the NSGS is considered an act of malice against the students of Lantreind and is illegal according to the National Education Test Act (NETA) verse 5:";
            cout<<'\n'<<"'For thee who dare to destroy a student's scores, shall be convicted in the name of the Veneroth name.'"<<'\n'<<"You have been warned.";
        }
}

Answer 2

更改：if (score*1.2<90, score*1.2>=0)
使用：if (score*1.2<90 && score*1.2>=0)
既然你想要完成这两个条件

更改：else if (score*1.2<180, score*1.2>=90)
使用：else if (score*1.2<180 && score*1.2>=90)
既然你想要完成这两个条件

更改：else if (score*1.2>180, score*1.2<0)
使用：else if (score*1.2>180 || score*1.2<0)
既然你想完成这两个条件之一

我的C ++代码关于'if和if else'函数和'pause'有什么问题？

2 个答案: