用&&来设置取值范围

用字符指针表示字符串

/*	&&运算符
	字符指针表示字符串
*/

#include<iostream>
using namespace std;

const char* qualify[4] = {
	"level-3",
	"level-2",
	"level-1",
	"level-super",
};

int main() {
	int age;
	cout << "input your age in years: ";
	cin >> age;
	int index;

	if (age > 17 && age < 35)
		index = 0;
	else if (age >= 35 && age < 50)
		index = 1;
	else if (age >= 50 && age < 65)
		index = 2;
	else
		index = 3;
	cout << "your qualify for the " << qualify[index];

	return 0;
}

输出

input your age in years: 45
your qualify for the level-2