random使用练习

lxr215

                random使用练习
public class RandomTest {
    public static void main(String[] args) {
        for(int i=1; i=100; i++) {
            System.out.print(randomInt(10,20) + "\t");
            if(i%10==0) {
                System.out.println();
            }
        }
    }
    
    public static double randomDouble() {
        double x = Math.random();
        return x;
    }
    
    public static double randomDouble(int high) {
        double x = Math.random();
        return x*high;
    }
    public static double randomDouble(int low, int high) {
        if(low > high) {
            System.out.println("Error");
            return 0.0;
        }
        double x = Math.random();
        return x * (high-low) + low ;
    }
    
    public static int randomInt(int low, int high) {
        if(low > high) {
            System.out.println("Error");
            return 0;
        }
        double x = Math.random();
        return (int)(x * (high-low) + low) ;
    }
    
}
               
               
               

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