9.11周一

今天上了java课，学会了好多东西，先写一下课堂测试吧
就是随机写30道题目给小学生，两位数加减乘除

#include<iostream>
using namespace std;
#include<time.h>
#include<cstdlib>
int main()
{
	srand((unsigned)time(NULL));
	int a, b, c;
	
	
	string m = "+-*/";
	for (int i = 0; i < 30; i++)
	{
		a = rand() % 100 + 1;
		b = rand() % 100 + 1;
		c = rand() % 4;
		cout << a << m[c] << b << "=" << endl;
	}
}