我的GPA计算不正确，即使支持的数学方法正确[重复]

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Dividing two integers to produce a float result [duplicate]（1个答案）

[<24天前关闭。

在我班级的模块中，我们正在编写一个程序，要求输入班级名称，等级和学分。在某些类的末尾，要求我们使用setprecision（2）将GPA计算为2个小数点。我所有的程序功能都除外，它计算出的GPA为3.00，而不是3.14。我的totalPoints达到22，totalCredits为7，因此应该以setprecision为3.14。关于为什么我得到3.00的任何见解？感谢您的帮助，因为我对此很陌生。

#include iostream
#include iomanip
#include string
//I took out the < and > because it made the words disappear

using namespace std;

int main(){
    cout<< std::fixed << std::setprecision(2);

    int totalCredits = 0;
    int gradePoints = 0;

    string courseName;
    cout<<"Enter a course name: ";
    getline (cin, courseName);
    cout<<courseName <<endl;

    int credits;
    cout<<"Enter number of credits: ";
    cin>>credits;
    cout<<credits <<endl;
    totalCredits = totalCredits + credits;

    string grade;
    cout<<"Enter your grade (A, B, C, D, F): ";
    cin>>grade;
    cout<<grade <<endl;

    if (grade == "A"){
      gradePoints = gradePoints + (4.00 * credits);
    }
    else if (grade == "B"){
      gradePoints = gradePoints + (3.00 * credits);
    }
    else if (grade == "C"){
      gradePoints = gradePoints + (2.00 * credits);
    }
    else if (grade == "D"){
      gradePoints = gradePoints + (1.00 * credits);
    }


    string answer;
    cout<<"Continue ('Yes' or 'No')? ";
    cin>>answer;
    cout<<answer <<endl;

    while (answer == "Yes"){
      cout<<"Enter a course name: ";
      cin.ignore();
      getline (cin, courseName);
      cout<<courseName <<endl;

      cout<<"Enter number of credits: ";
      cin>>credits;
      cout<<credits <<endl;
      totalCredits = totalCredits + credits;

      cout<<"Enter your grade (A, B, C, D, F): ";
      cin>>grade;
      cout<<grade <<endl;

      if (grade == "A"){
         gradePoints = gradePoints + (4.00 * credits);
      }
      else if (grade == "B"){
         gradePoints = gradePoints + (3.00 * credits);
      }
      else if (grade == "C"){
         gradePoints = gradePoints + (2.00 * credits);
      }
      else if (grade == "D"){
         gradePoints = gradePoints + (1.00 * credits);
      }


      cout<<"Continue ('Yes' or 'No')? ";
      cin>>answer;
      cout<<answer <<endl;
    }

    cout<<"Total grade points: " <<gradePoints <<endl;
    cout<<"Total credits attempted: " <<totalCredits <<endl;

   float gpa = 0;
   gpa = gradePoints/totalCredits;
   cout<<"Your GPA is " <<gpa <<endl;



   return 0;  
}

Answer 1

int除以int会得到一个int。通过除法语句在变量名称之前添加（双精度）来强制转换其中之一。

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其他注意事项：

您正在重复几乎整个程序，只是要确保它执行一次。您只需将答案设置为“是”，就知道它将执行。
• cin <getLine()并根据需要进行解析more info。 （可能是功课的过度杀伤...）这种情况下的快速修复程序是使用ignore()清除流，并使用clear()重置流。示例工作程序here。