C++错误“预期的非限定id”（'令牌“在调试之前

Question

所以我试图开始调试我的代码有什么问题，但我目前有一个问题，我不明白的错误。使用代码块通过Oracle虚拟机。我很确定问题在于我的代码的标题，但我会发布整个事情。

我想构建一个使用头文件，原型， 。和功能到目前为止，我只需要基本的数学工作

错误Messege写着： || ===体形：调试在贾维斯。（编译：GNU GCC编译）=== | /家庭/用户/ Dropbox的/ Lecture36CompilationAnd内存/ JARVIS/JARVIS.h | 1 |错误：预期在''''令牌|之前的非限定ID || ===构建失败：1个错误，0个警告（0分（s），0秒（s））=== |

的main.cpp

#include <iostream> 
#include <string> 
#include "JARVIS.h" 

using namespace std; 

int main() 
{ 
    string command; 
    bool jarvis_running = false; 
    cout << "J.A.R.V.I.S" << endl; 
    cout << "Give a command from the list of commands available." << endl; 
    cin >> command; 

    if (command == "-h") 
    { 
     jarvis_running = true; 
     cout << "The available commands are: math" << endl; 
    } 

    if (command = "math") 
    { 
     jarvis_running = true; 
     math(); 
    } 

    if (jarvis_running == false) 
    { 
     cout << "That command was not valid" << endl; 
     cout << "Type '-h' if you need to know the available commands." << endl; 
    } 

    return 0; 
} 

* JarvisFunctions.cpp

#include <iostream> 
#include <string> 
#include "JARVIS.h" 

using namespace std; 

int math() 
{ 
    char mathCommand; 

    cout << "(A)ddition, (S)ubtraction, (M)ultiplication, or (D)ivision?" << endl; 
    cin >> mathCommand; 

    if (mathCommand == "A") 
    { 
     cout << "input the two integers you are adding" << endl; 
     cin >> integer1 >> integer2; 

     math.setValues(integer1, integer2); 
     addition add; 
    } 


    else if(mathCommand == "S") 
    { 
     cout << "input the two integers you are subtracting" << endl; 
     cin >> integer1 >> integer2; 

     math.setValues(integer1, integer2); 
     subtraction sub; 
    } 

    else if(mathCommand == "M") 
    { 
     cout << "input the two integers you are multiplying" << endl; 
     cin >> integer1 >> integer2; 

     math.setValue(integer1, integer2); 
     mulitplication multi; 
    } 

    else if(mathCommand == "D") 
    { 
     cout << "input the two integers you are dividing" << endl; 
     cin >> integer1 >> integer2; 

     math.setValues(integer1, integer2); 
     division div; 
    } 

    else 
    { 
     cout << "you did not input the right fuctions, either use A, S, M, or D" << endl; 
    } 
} 

头

JARVIS.h

#ifndef JARVIS_H 
    #define JARVIS_H 

    int math(); 

    class math 
    { 
     private: 
     int val1; 
     int val2; 

     public: 

     math() 
     { 
      cout<<"calling math constructor"<<endl; 
     } 

     void setValues (int a, int b){ 
      val1 = a; 
      val2 = b; 
     } 

     ~math() 
     { 
      cout<<"calling math deconstructor"<<endl; 
     } 

    }; 

    int addition:public math 
    { 
     finalVal = val1 + val2; 
     return finalVal; 
    }; 

    int subtraction:public math 
    { 
     finalVal = val1 - val2; 
     return finalVal; 
    }; 

    int multiplication:public math 
    { 
     int finalVal = val1 * val2; 
     return finalVal; 
    }; 

    int division:public math 
    { 
     int finalVal = val1/val2; 
     return finalVal; 
    }; 

    #endif //JARVIS_H 

Answer 1

有你有什么很多的误解。你真的应该花更多的时间与你学习的任何资源。

的main.cpp

#include <iostream> 
#include <string> 
#include "JARVIS.h" 

int main() 
{ 
    std::string command; 
    bool jarvis_running = false; 
    std::cout << "J.A.R.V.I.S" << std::endl; 
    std::cout << "Give a command from the list of commands available." << std::endl; 
    std::cin >> command; 

    if (command == "-h") 
    { 
     jarvis_running = true; 
     std::cout << "The available commands are: math" << std::endl; 
    } 

    if (command == "math") 
    { 
     jarvis_running = true; 
     int result = math(); 
     std::cout << "result = " << result << std::endl; 
    } 

    if (jarvis_running == false) 
    { 
     std::cout << "That command was not valid" << std::endl; 
     std::cout << "Type '-h' if you need to know the available commands." << std::endl; 
    } 

    return 0; 
} 

JARVIS.h

#ifndef JARVIS_H 
#define JARVIS_H 

#include <iostream> 

int math(); 

class Math 
{ 
    private: 
    int val1; 
    int val2; 

    public: 

    Math() 
    { 
     std::cout<<"calling math constructor"<<std::endl; 
    } 

    void setValues (int a, int b){ 
     val1 = a; 
     val2 = b; 
    } 

    ~Math() 
    { 
     std::cout<<"calling math deconstructor"<<std::endl; 
    } 


    int addition() 
    { 
     int finalVal = val1 + val2; 
     return finalVal; 
    } 

    int subtraction() 
    { 
     int finalVal = val1 - val2; 
     return finalVal; 
    } 

    int multiplication() 
    { 
     int finalVal = val1 * val2; 
     return finalVal; 
    } 

    int division() 
    { 
     int finalVal = val1/val2; 
     return finalVal; 
    } 

}; 

#endif //JARVIS_H 

JarvisFunctions.cpp

#include <iostream> 
#include <string> 
#include "JARVIS.h" 

int math() 
{ 
    std::string mathCommand; 

    std::cout << "(A)ddition, (S)ubtraction, (M)ultiplication, or (D)ivision?" << std::endl; 
    std::cin >> mathCommand; 

    int integer1, integer2; 

    // create an instance of Math class 
    Math m; 
    if (mathCommand == "A") 
    { 
     std::cout << "input the two integers you are adding" << std::endl; 
     std::cin >> integer1 >> integer2; 

     m.setValues(integer1, integer2); 
     return m.addition();; 
    } 


    else if(mathCommand == "S") 
    { 
     std::cout << "input the two integers you are subtracting" << std::endl; 
     std::cin >> integer1 >> integer2; 

     m.setValues(integer1, integer2); 
     return m.subtraction(); 
    } 

    else if(mathCommand == "M") 
    { 
     std::cout << "input the two integers you are multiplying" << std::endl; 
     std::cin >> integer1 >> integer2; 

     m.setValues(integer1, integer2); 
     return m.multiplication(); 
    } 

    else if(mathCommand == "D") 
    { 
     std::cout << "input the two integers you are dividing" << std::endl; 
     std::cin >> integer1 >> integer2; 

     m.setValues(integer1, integer2); 
     return m.division(); 
    } 

    else 
    { 
     // TODO: add some sort of error handling 
     std::cout << "you did not input the right fuctions, either use A, S, M, or D" << std::endl; 
     return 0; 
    } 

}