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 :

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.
        Enter a letter grade: B
        The numeric value is 2.7

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;

    }

它能够打印出4表示A，3表示B等等。但是，这个问题需要我们计算+和 - 。我应该使用if else语句后切换？

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

任何帮助将不胜感激。提前感谢。

Any help would be appreciated. Thanks in advance.

推荐答案

如果输入为 A + c $ c> B - ，那么它不再是字符了。所以，使用一个字符串的字符串，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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