Question

编写个JAVA程序（1）随机产生200个三位的正整数，按每行十个数输出（2）统计偶数个数（3)偶数出现的概率

非专业人士勿进,程序尽量简明.

Answer 1

import java.util.*;

class Test {
public static void main(String[] args) {
Random rand = new Random();
int[] a = new int[200];
int count=0;
for(int i=0;i<a.length;i++){
a[i] = Math.abs(rand.nextInt(900))+100;
System.out.print(a[i]+"\t");
if(a[i]%2==0){
count++;
}
if(i%10==9){
System.out.println();
}
}
System.out.println("偶数个数为:"+count);
System.out.println("偶数概率为:"+(count/200.0));
}

}