情報科学I

Letter.java

public class Letter
{
    public static void main(String args[]) {
        char ch = args[0].charAt(0);
        System.out.println("Input a letter[A-E] : " + ch);
        switch(ch) {
        case 'A':
            System.out.println("Excellent");
            break;
        case 'B':
            System.out.println("Very Good");
            break;
        case 'C':
            System.out.println("Good");
            break;
        case 'D':
            System.out.println("Fair");
            break;
        case 'E':
            System.out.println("Poor");
            break;
        default:
            System.err.println("letter error : Unknown character '" + ch + "'");
        }
    }
}

ScopeOfNum.java

public class ScopeOfNum
{
    public static void main(String args[]) {
        int num = Integer.parseInt(args[0]);
        if(num >= 0 && num < 10) {
            System.out.println(num + " is OK");
        } else {
            System.out.println(num + " is NG");
        }
    }
}

Star.java

public class Star
{
    public static void main(String args[]) {
        int num_stars = Integer.parseInt(args[0]);
        System.out.println("input number : " + num_stars);
        for(int i = 0; i < num_stars; i++) System.out.print("*");
    }
}

Star2.java

public class Star2
{
    public static void main(String args[]) {
        int num_stars = Integer.parseInt(args[0]);
        System.out.println("input number : " + num_stars);
        int i = 0;
        while(i < num_stars) {
            System.out.print("*");
            i++;
        }
    }
}

Star3.java

public class Star3
{
    public static void main(String args[]) {
        int num_stars = Integer.parseInt(args[0]);
        System.out.println("input number : " + num_stars);
        int i = 0;
        while(true) {
            if(i == num_stars) break;
            System.out.print("*");
            i++;
        }
    }
}