2017-11-11

2017.11.11  靳艺伦【第一天】

今天开始编写一个随机计算器程序。实现随机产生一个可以自己选择难度，并且可以统计做对题目数的随机计算。

#include<iostream>

#include<cmath>

#include<ctime>

using namespace std;

static  int n=0, s=0;//用来统计算对的和算错的题目数量

int random(int x)//定义一个可以生成随机数值的函数

{

int b, c;//b表示输出值，c作为一个中间变量，用于b的赋值

c = pow(10, 5-x);

b = rand() / c;//随机生成一个小于c的数

return b;

}

void count(char sign,double shu1,double shu2)//定义一个计算器函数

{

double answer, test;

switch(sign)

{

case'+':cout << shu1 << "+" << shu2 << "=?";

cin >> answer;

test = shu1 + shu2;

if (test == answer)

    { cout << "You're right！" << endl; n = n + 1; }

else cout << "You're wrong！" << endl;

s = s + 1;

break;

case'-':cout << shu1 << "-" << shu2 << "=?";

cin >> answer;

test = shu1 - shu2;

if (test == answer)

{

cout << "You're right！" << endl; n = n + 1;

}

else cout << "You're wrong！"<< endl;

s = s + 1;

break;

case'*':cout << shu1 << "*" << shu2 << "=?";

cin >> answer;

test = shu1 *shu2;

if (test == answer)

{

cout << "You're right！" << endl; n = n + 1;

}

else cout << "You're wrong！" << endl;

s = s + 1;

break;

case'/':cout << shu1 << "/" << shu2 << "=?";

//assert(shu2 != 0 && shu1 <shu2);

cin >> answer;

test = shu1/ shu2;

if (test == answer)

{

cout << "You're right！" << endl; n = n + 1;

}

else cout << "You're wrong！" << endl;

s = s + 1;

break;

}

}

int main()

{

int x;

char sign;

cout << "请选择难度1或2" << endl;

cin >> x;

cout << "请选择计算方法" << endl;

cin >> sign;

int shu1, shu2;

do {srand(time(0));

shu1 = random(x);

srand(rand());

shu2 = random(x);

count(sign, shu1, shu2);

cout << "算对的题数为" << n << '\t' << "算错的题数为" << s - n << endl;;

system("pause");

} while (s < 11);

}

明日计划：（I）对这个程序的部分不足进行改正：（1）修正除法时可能出现分母为0的情况（2）修正选择难度为2时可能出现难度1的题目的情况。

（II）复习函数内容，开始学习数组