-2

ユーザーが入力した日数で今日が何日になるかを計算する短いプログラムです。私は土曜日であるDAY 6から始めています。ループを使用してコードを短くする方法はありますか?

import java.util.Scanner;

class Week{
    public static void main(String args[]){
        Scanner input = new Scanner(System.in);

        int days[] = {1,2,3,4,5,6,7,8};
        String dayNames[] = {"Monday","Tuesday","Wednesday","Thursday","Friday",
                "Saturday", "Sunday"};
        int numdays;

        System.out.println("Enter how many days from now: ");
        numdays = input.nextInt();

        numdays = (6 + numdays) % 7;

        if(numdays == 0){
            System.out.println(dayNames[6]);
        }
        else if(numdays == 1 ){
            System.out.println(dayNames[0]);
        }
        else if(numdays == 2){
            System.out.println(dayNames[1]);
        }
        else if(numdays == 3){
            System.out.println(dayNames[2]);
        }
        else if(numdays == 4){
            System.out.println(dayNames[3]);
        }
        else if(numdays == 5){
            System.out.println(dayNames[4]);
        }
        else if(numdays == 6){
            System.out.println(dayNames[5]);
        }
    }
}
4

5 に答える 5

3

次のセクション:

if(numdays == 0){
    System.out.println(dayNames[6]);
}
else if(numdays == 1 ){
    System.out.println(dayNames[0]);
}
else if(numdays == 2){
    System.out.println(dayNames[1]);
}
else if(numdays == 3){
    System.out.println(dayNames[2]);
}
else if(numdays == 4){
    System.out.println(dayNames[3]);
}
else if(numdays == 5){
    System.out.println(dayNames[4]);
}
else if(numdays == 6){
    System.out.println(dayNames[5]);
}

... は簡単に次のように置き換えられます。

System.out.println(dayNames[(numdays + 6) % 7)]);
于 2013-05-10T04:50:01.883 に答える
2

日曜日から始めます:

String dayNames[] = {"Sunday", "Monday","Tuesday","Wednesday","Thursday","Friday",
            "Saturday"};

大きな if/else を次のように置き換えます。

System.out.println(dayNames[numdays]);
于 2013-05-10T04:49:39.390 に答える
1

switch複数の if ステートメントの代わりに caseを使用できます

お気に入り

switch(numdays) {
  case 1:  ....  break;
  case 2: ..... break;
.....
}

また

String dayNames[] = {"Sunday", "Monday","Tuesday","Wednesday","Thursday",
  "Friday","Saturday"};

次に、インデックスを直接指定できます

System.out.println(dayNames[numdays]);
于 2013-05-10T04:48:23.237 に答える
0 
for(numdays=0;numdays<=6;numdays++){
System.out.println(dayNames[(numdays + 6) % 7)]);
}
于 2013-05-10T04:49:31.820 に答える
0

ループはいらない

String dayNames[] = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday",
                "Sunday" };
int i  = (5 + numdays) % 7;
System.out.println(dayNames[i]);
于 2013-05-10T05:02:15.290 に答える