c++ - 链接错误 : undefined references to stdscr and wgetch

Question

这个问题在这里已经有了答案:





Undefined reference to `stdscr' while using ncurses

(7 个回答)


1年前关闭。




我对 C++ 很陌生，需要一些帮助来纠正其中的一些错误。我使用 G++ 来编译我的代码。这是我的代码:

#include<iostream>
#include<stdio.h>
#include<math.h>
#include<iomanip>
#include<ncurses.h>
  char op;
using namespace std;
void sum()
   {

    int sum = 0;
    int n;
    int numberitems;
    cout << "Enter number of items: \n";
    cin >> numberitems;

    for(int i=0;i<numberitems;i++)
    {
        cout<< "Enter number "<<i<<":\n\n" ;
        cin>>n; 
        sum+=n;
    }
    cout<<"sum is: "<< sum<<endl<<endl;

    }
void diff()
    {
     int diff;
     int n1,n2;
     cout<<"enter two numbers to find their difference:\n\n";
     cout<<"enter first number:";
     cin>>n1;
     cout<<"\nenter second number:";
     cin>>n2;
     diff=n1-n2;
     cout<<"\ndifference is:"<<diff<<endl<<endl;
     }

void pro()

    {
     int pro=1;
     int n;
     int numberitems;
     cout<<"enter number of items:\n";
     cin>>numberitems;
     for(int i=0;i<=numberitems;i++)
     {
             cout<<"\nenter item "<<i<<":";
             cin>>n;
             pro*=n;
     }

     cout<<"product is:"<<pro<<endl<<endl;    
     }

 void div()
     {
      int div;
      int n1;
      int n2;
      cout<<"enter 2 numbers to find their quotient\n\n";
      cout<<"enter numerator:";
      cin>>n1;
      cout<<"\nenter denominator:";
      cin>>n2;
      div=n1/n2;
      cout<<"\nquotient is:"<<div<<endl<<endl;
      }      

void power()
     {     
     long int p;
     int res=1,n; 
     cout<<"enter number:";
     cin>>n;
     cout<<"\nenter power:";
     cin>>p;
     for(int i=1;i<=p;i++)
     {
      res=n*res;
     }
      cout<<n<<"\n power "<<p<<" is :"<<res<<endl;
     } 

void sq()
     {
     float s;
     int n;
     cout<<"enter number to find its square root:";
     cin>>n;
     s=sqrt(n);
     cout<<"\nsquare root of "<<n<<" is :"<<s<<endl;
     }
 void fact()
     {
      long int f=1;
      int c=1,n;
      cout<<"enter number to find its factorial:";
      cin>>n;
      while(c<=n)
      {
                 f=f*c;
                 c+=1;
      }     
                 cout<<"\nfactorial of "<<n<<" is :"<<f<<endl;     
      }
void expo()
     {
          long double res=1,p; 
     double e=2.718281828;     
     cout<<"enter power of exponential function:";
     cin>>p;
     for(int i=1;i<=p;i++)
     {
      res=e*res;
     }
      cout<<" e^ "<<p<<" is :"<<res<<endl;

           }
int main()
{   


    system("cls");
    do
    {

    system("pause");              
    system("cls");    
    cout<<"***which operation you want to perform***\n";
    cout<<"press 0 for exit\n";
    cout<<"press 1 for addition \n";
    cout<<"press 2 for subtraction\n";
    cout<<"press 3 for multiplication\n";
    cout<<"press 4 for division\n";
    cout<<"press 5 for power calculation\n";
    cout<<"press 6 for square root \n";
    cout<<"press 7 for factorial calculation\n";
    cout<<"press 8 for exponential calculation\n";
    cout<<"press option:";
    cin>>op;
    switch(op)
    {
              case '1':
              sum();

              break;
              case '2':
              diff();
              break;
              case '3':
              pro();
              break;
              case '4':
              div();
              break;
              case '5':
              power();
              break;
              case '6':
              sq();
              break;
              case '7':
              fact();
              break;
              case '8':
              expo();
              break;     
              case '0':
              exit(0);    
              default:
              cout<<"invalid input"  ;
              system("cls");
    } 
    }

    while(op!='0');

                    getch();
                    }

当我在终端输入 g++ foo.cpp ， 有时候是这样的:

/usr/bin/ld: /tmp/ccT73Aw3.o: in function `main':
calc.cpp:(.text+0x950): undefined reference to `stdscr'
/usr/bin/ld: calc.cpp:(.text+0x958): undefined reference to `wgetch'
collect2: error: ld returned 1 exit status

有人可以帮我解决这个问题吗？
这应该是一个计算器。我在使用 #include 时遇到了一些问题部分，但我认为我解决了这些问题。例如，对于 <ncurses.h>我试过 <conio.h>但后来意识到这是一个 MS-DOS 头文件。请帮忙。
谢谢你。

Answer 1

试试这个。

g++ foo.cpp -lncurses

您必须将 ncurses 链接到您的程序，因为它不是标准头文件。如果您没有它，您可能还需要安装它。当我第一次学习 C++ 时，我在制作基于终端的游戏时遇到了同样的问题