C++中的评分系统 [英] Grading system in C++

问题描述

所以这是我的 C++ 问题:

So this is my C++ question :

编写一个程序，将字母等级转换为数字等级.字母等级是 A、B、C、D 和 F，后面可能跟着 + 或 -.它们的数值是 4、3、2、1 和 0.没有 F+ 或 F-.A + 将数值增加 0.3，a - 将数值减少 0.3.但是，A+ 的值为 4.0.

Write a program that translates a letter grade into a number grade. Letter grades are A, B, C, D and F, possibly followed by + or -. Their numeric values are 4, 3, 2, 1 and 0. There is no F+ or F-. A + increases the numeric value by 0.3, a – decreases it by 0.3. However, an A+ has value 4.0.

输入字母等级:B
数值为2.7

Enter a letter grade: B
The numeric value is 2.7

这是我的代码:

int main ()
{
    char grade;
    int value;
    cout << "Enter letter grade : " ;
    cin >> grade;

    switch(grade)
    {
    case 'A' : value = 4;
        break;
    case 'B' : value =  3;
        break;
    case 'C' : value = 2;
        break;
    case 'D' : value = 1;
        break;
    case 'E' : value = 0;
        break;
    default : cout << "Wrong input " << endl;
        break;
    }

    cout << value;
    system("PAUSE");
    return 0;
}

它可以为 A 打印 4，为 B 打印 3，依此类推.但是，这个问题要求我们也对 + 和 - 进行计算.我应该在切换后使用 if else 语句吗?

It able to print out 4 for A, 3 for B and so on. But however, the question required us to make the calculation for the + and - also. Am I supposed to use if else statement after the switch?

推荐答案

如果输入的是A+或者B-，那么就不是字符了.因此，使用一串字符获取它，并检查值.

If the input is A+ or B-, then it is not a character anymore. So, get it using a string of chars, and check the values.

char a[3];
float m,n;
cin>>a;
if(a[1]=='+')
   m=0.3;
else if (a[1]=='-')
   m=-0.3;
else
    m=0;
switch(a[0])
{
  //Assign the value of n as 4,3,2,1 depending upon the grade.
}
cout<<n+m;

将打印成绩

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