C++程序设计 （第三版） 谭浩强 习题3.11

习题 3.11 给出一个百分制的成绩，要求输出成绩等级’A’，‘B’，‘C’，‘D’，‘E’。90分以上为’A’，80_{89分为’B’，70}79分为’C’，60~69分为’D’，60分以下为’E’。

IDE工具：VS2010

Note: 使用不同的IDE工具可能有部分差异。

代码块

方法1：

#include <iostream>
using namespace std;
int main()
{
	float score;
	int d;
	
	cout<<"Please enter score: ";
	cin>>score;
	
	d=score/10;
	switch(d){
	case 0:
	case 1:
	case 2:
	case 3:
	case 4:
	case 5: cout<<"Grade= "<<'E'; break;
	case 6: cout<<"Grade= "<<'D'; break;
	case 7: cout<<"Grade= "<<'C'; break;
	case 8: cout<<"Grade= "<<'B'; break;
	case 9:
	case 10: cout<<"Grade= "<<'A'; break;
	default: cout<<"Error!"; break;
	}
	cout<<endl;
	
	system("pause");
	return 0;
}

方法2：使用函数的模块化设计

#include <iostream>
using namespace std;

void grade(int score){
	if(score < 0 || score > 100){
		cout<<"Score Error!"<<endl;
		return;
	}

	cout<<"Grade = ";
	int g = score / 10;
	switch(g){
	case 0:
	case 1:
	case 2:
	case 3:
	case 4:
	case 5: cout<<"E"<<endl; break;
	case 6: cout<<"D"<<endl; break;
	case 7: cout<<"C"<<endl; break;
	case 8: cout<<"B"<<endl; break;
	case 9:
	case 10: cout<<"A"<<endl; break;
	default: break;
	}
}

int main(){
	int score;
	cout<<"Enter Score: ";
	cin>>score;

	grade(score);
	
	system("pause");
	return 0;
}