資訊學奧賽一本通 2057：【例3.9 】星期幾

【題目連結】

ybt 2057：【例3.9 】星期幾

【題目考點】

1. switch語句

2. if…else if語句

3. 字元數組或string類數組

【題解代碼】

解法1：switch語句

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin >> n;
	switch(n)
	{
		case 1:
			cout << "Monday";
			break;
		case 2:
			cout << "Tuesday";
			break;
		case 3:
			cout << "Wednesday";
			break;
		case 4:
			cout << "Thursday";
			break;
		case 5:
			cout << "Friday";
			break;
		case 6:
			cout << "Saturday";
			break;
		case 7:
			cout << "Sunday";
			break;
		default:
			cout << "input error!";
	}
	return 0; 
}
           

解法2：if…else if語句

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin >> n;
	if(n == 1)
		cout << "Monday";
	else if(n == 2)
		cout << "Tuesday";
	else if(n == 3)
		cout << "Wednesday";
	else if(n == 4)
		cout << "Thursday";
	else if(n == 5)
		cout << "Friday";
	else if(n == 6)
		cout << "Saturday";
	else if(n == 7)
		cout << "Sunday";
	else
		cout << "input error!";
	return 0; 
}
           

解法3：使用string類數組

設定一個string類數組s，使得s[i]的值為星期i的英文單詞。

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int i;
	string s[8] = {"", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
	cin >> i;
	if(i >= 1 && i <= 7)
		cout << s[i];
	else
		cout << "input error!";
	return 0; 
}