随机生成题目运算

package p;

import java.lang.Math;

public class Suanshu {

public static void main(String[] args) {
int[] a = new int[30];
for (int i = 0; i < 30; i++) {

int A = (int) (Math.random() * 100);
int B = 1 + (int) (Math.random() * 100);
int C = 1 + (int) (Math.random() * 4);
if (C == 1) {
System.out.println(A + "+" + B + "=?");
a[i] = A + B;
}
if (C == 2) {
System.out.println(A + "-" + B + "=?");
a[i] = A - B;
}
if (C == 3) {
System.out.println(A + "*" + B + "=?");
a[i] = A * B;
}
if (C == 4) {
if (B != 0) {
System.out.println(A + "/" + B + "=?");
a[i] = A / B;
}

}
}
System.out.print("答案是");
for (int i = 0; i < 30; i++)
{
System.out.print(i+1 +"."+a[i]+" ");
}

}

}