用if——else语句与switch语句判断学生成绩等级进行对比

1. (if-else语句)

#include <iostream>
using namespace std;
int main()
{
	int score;
	char grade;
	cin>>score;
	if (score > 100)
		cout << "这个数超出了范围，请重新输入：";
	else if (score>= 90)
		grade='A';
	else if (score >= 80)
		grade='B';
	else if (score >= 60)
		grade='C';
	else
		grade='D';
	cout << score << "的等级是" << grade << endl;

	return 0;
}

 2.（switch语句）

#include <iostream>
using namespace std;
int main()
{
	char grade;
	int score;
	cin >> score;
	switch (score / 10)
	{
	case 10:
	case 9:
		grade = 'A'; break;
	case 8:
		grade = 'B'; break;
	case 7:
	case 6:
		grade = 'C'; break;
	default :
		grade = 'D'; break;
	}
	cout << score << "的等级为" << grade << endl;
	return 0;
}