在將用戶輸入存儲到二維數組時將覆蓋值

Question

我對C++很陌生，我試圖編寫一個系統，其中用戶正在提示選擇選項。所以當用戶選擇選項1時，它們會提示輸入7值並存儲到二維數組中。但這是存儲部件問題進入的地方，當用戶再次選擇選項1輸入7值時，數組中的值將被覆蓋。當用戶選擇選項2時，打印出的值是最新輸入值的循環。

舉例來說，輸入的第一組值爲'1,2,3,4,5,6,7'，而當用戶再次選擇選項1時輸入的第二組值爲'a，b ，c，d，e，f，g'，當我打印出數組時，數組只顯示g而不是7和g。

希望如果有人能就這個問題給我建議。

 #include <iostream>  // cin, cout 
     #include <fstream>  // ifstream, ofstream 
     #include <sstream>  // stringstream 
     #include <string> 
     #include <stdio.h> 
     #include <iomanip>  // std::setw 
     #include <stdlib.h>  /* atoi */ 
     #include "Printer.h" 
     #include <termios.h> //password masking 
     #include <unistd.h> 
     using namespace std; 


     void displayoption(int); 
     void GetInput(); 
     void DisplayInput(); 
     void writeUserDatabase(); 

     struct DataPile 
     { 
      // to record stock information. 
      string x; 
      string y; 
      string suntype; 
      string planet; 
      string moons; 
      string particulate; 
      string plasma; 

     }; 



     const int MAX = 50; 
     Printer printer; 
     DataPile datapile[MAX][7]; 






     int main() 
     { 
      system("clear"); 
       printer.printName(); 
     printer.printmainheader(); //display 



     int option =-1; //initialise int 
      do 
      { 

      printer.printdisplaymainmenu(); //display menu 
      cout<< endl<<"  "<<"Enter Option :"; 

      cin>>option; 
      displayoption(option); 

      }while(option!=5); 


     } 





     void displayoption(int option) 
     { 
     //option control functions 
      switch(option) 
      { 
      case 1: 
      GetInput(); 

      break; 
      case 2: 
      printer.printcompute(); 
      DisplayInput(); 



      //addstock(); 
      break; 
      case 3: 

      break; 
      case 4: 

      break; 
      case 5: 

      break; 
      case 6: 

      break; 
      case 9: 

      break; 
      default:break; 
      } 
     } 




     void GetInput() 
     { 

      string x; 
      string y; 
      string suntype; 
      string planet; 
      string moons; 
      string particulate; 
      string plasma; 


      //getting input from user 
      cout<<""; 
      getline(cin, x); 
      cout<<"Please enter x-ordinate :"; 
      getline(cin, x); 

      cout<<"Please enter y-ordinate :"; 
      getline(cin, y); 

      cout<<"Please enter sun type :"; 
      getline(cin, suntype); 

      cout<<"Please enter no. of earth-like planets :"; 
      getline(cin, planet); 

      cout<<"Please enter no. of earth-like moons :"; 
      getline(cin, moons); 

      cout<<"Please enter ave. particulate density (%-tage) :"; 
      getline(cin, particulate); 

      cout<<"Please enter ave. plasma density (%-tage) :"; 
      getline(cin, plasma); 




      //cout<<x<<" "<<y<<suntype<<planet<<moons<<particulate<<plasma<<endl; 


      //storing to array 
     for(int i = 1; i <=8; i++){ 
        for (int j=1 ; j<=7 ; ++j) { 


      datapile[i][j].x = x; 
      datapile[i][j].y = y; 
      datapile[i][j].suntype = suntype; 
      datapile[i][j].moons = moons; 
      datapile[i][j].planet = planet; 
      datapile[i][j].particulate = particulate; 
      datapile[i][j].plasma = plasma; 
      } 
     } 


      cout<<"  \E[1;29mRecord successfully stored. Going back to main menu\E[0m"<<endl; 
     printer.printName(); 

     } 


     void DisplayInput() 
     { 

      string x; 
      string y; 
      string suntype; 
      string planet; 
      string moons; 
      string particulate; 
      string plasma; 


      for (int i=0; i<=1; i++) 
     { 
      for(int j=0; j<=6; j++) 
      { 
       cout << datapile[i][j].plasma<<endl; 

      } 
     } 

     } 

Answer 1

在此循環中，使用+ =而不是+。這會將新輸入附加到字符串上，因此您既有舊值又有新值。

for(int i = 1; i <=8; i++){ 
    for (int j=1 ; j<=7 ; ++j) { 
     datapile[i][j].x += x; 
     datapile[i][j].y += y; 
     datapile[i][j].suntype += suntype; 
     datapile[i][j].moons += moons; 
     datapile[i][j].planet += planet; 
     datapile[i][j].particulate += particulate; 
     datapile[i][j].plasma += plasma; 
     } 
    }