main.cpp

易学c++程序实例 本章主要讲述一些学习程序设计前需要了解的一些知识和一些学习程序设计的方法。并且对 C++语言作了一个简要的介绍。学好这一章

#include "iostream.h"
#include "stdlib.h"
#include "time.h"
void main()
{
	int a,b,numOfQues=0,numOfRight=0;
	char inquiry;
	srand(time(NULL));
	cout <<"***欢迎你来做100以内的加减法***" <<endl;
	do
	{
		int temp=rand()%2;
		a=rand()%100;
		b=rand()%100;
		switch (temp)
		{
		case 0:
			{
				int ans;
				cout <<a <<'+' <<b <<'=';
				cin >>ans;
				if (ans==a+b)
				{
					numOfRight++;
					cout <<"恭喜！答对了！" <<endl;
				}
				else cout <<"答错了，再接再厉！" <<endl;
				break;
			}
		case 1:
			{
				int ans;
				cout <<a <<'-' <<b <<'=';
				cin >>ans;
				if (ans==a-b)
				{
					numOfRight++;
					cout <<"恭喜！答对了！" <<endl;
				}
				else cout <<"答错了，再接再厉！" <<endl;
			}
		}
		numOfQues++;
		cout <<"你还要再做一题吗？（N表示不要）" <<endl;
		cin >>inquiry;
	}while (inquiry!='N' && inquiry!='n');
	cout <<"你的答题正确率为" <<numOfRight*100/numOfQues <<"%。再见！" <<endl;
}