Question

我希望我的数组输入使得它不能具有两次相同的数字：然而，这将有一个输出＆＃34;值存在请重新输入：＆＃34 ;; 两次。我如何检查它是否是唯一的，如果之前已经初始化，只显示一次？

int main(){
  int arr_size = 10;
  int value;
  int aArray[10];
  for(int i=0;i<arr_size;i++)
  {
        cout<<"enter value of slot"<<i+1<<": ";
        cin>>value;

        for(int j=0;j<arr_size;j++){

          if(value == aArray[j])
          {
            cout<<"value exist please re enter: ";
            cin>>value;
          }
          else{

          aArray[i] = value;
          }
        }
    }

  }

Answer 1

更改为：

  for(int i=0;i<arr_size;i++)
  {
      cout<<"enter value of slot"<<i+1<<": ";
      while(1) { //You must keep reading until you have read a valid value
        cin>>value;
        bool alreadyPresent = false;    

        for(int j=0;j<i;j++){ //You only have to check against already inserted values!
                              //Before you were checking against uninitialized values!!
          if(value == aArray[j])
          {
            alreadyPresent = true;
            break; //I don't need to further iterate the array
          }

        }

        if (alreadyPresent)
          cout<< std::endl << value exists, please re enter: ";
        else
          break; //I can proceed with the next value, user has not to reenter the value
       }
     aArray[i] = value;

     std::cout << std::endl; //next line...
  }

替代：

  for(int i=0;i<arr_size;i++)
  {
      cout<<"enter value of slot"<<i+1<<": ";

      bool alreadyPresent;
      do { //You must keep reading until you have read a valid value
        cin>>value;
        alreadyPresent = false;    

        for(int j=0;j<i;j++){ //You only have to check against already inserted values!
                              //Before you were checking against uninitialized values!!
          if(value == aArray[j])
          {
            alreadyPresent = true;
            cout<< std::endl << value exists, please re enter: ";
            break; //I don't need to further iterate the array
          }

        }

      } while (alreadyPresent);
     aArray[i] = value;

     std::cout << std::endl; //next line...
  }

如何使用不同的值填充数组

1 个答案: