c++ - 似乎一切正常，除了添加

Question

我有以下代码:

#include <iostream>
#include <string>
using namespace std;

int main() 
{
  int LoanValue, LoanRate, LoanValue2;
  cout << "Loan: ";
  cin >> LoanValue;
  cout << "Loan Rate: ";
  cin >> LoanRate;
  LoanValue2 = LoanValue+(LoanValue*(LoanRate/100));
  cout << LoanValue << ", " << LoanValue2 << ", " << LoanValue2/12;
}

如果输入是 6000，那么它会输出 6000、6000 和 5000。它只是看不出 LoanValue2 实际执行了加法。不知道有什么问题

编辑:知道了。这样做:

   #include <iostream>
   #include <string>
   using namespace std;

   int main() 
   {
      int LoanValue, LoanRate;
      double LoanValue2;
      cout << "Loan: ";
      cin >> LoanValue;
      cout << "Loan Rate: ";
      cin >> LoanRate;
      LoanValue2 = LoanValue+(LoanValue*(double(LoanRate)/100));
      cout << LoanValue << ", " << LoanValue2 << ", " << LoanValue2/12;
    }

Answer 1

因为你所有的变量都是整数，所以你在这里使用整数除法:

LoanValue2 = LoanValue+(LoanValue*(LoanRate/100));

例如如果 LoanRate 为 5，则 5/100 == 0。您可以使用 double 变量修复它。