First change
/** *程序功能：没有实现中文或英文或日文的选择。
- 倒计时功能（这个功能我百度了一下 需要mfc和多线程技术支持 实在做不出来 我把它改成了一个记录答题时间） *程序功能：实现了 判断对错 累计分数 记录答题时间（秒为单位）
- 支持多个运算符 支持括号
- 具体生成算数 是采用的switch分支结构
*/ #include<windows.h> #include #include #include #include using namespace std; float Practice(); int main() { int count = 0; int right = 0; int wrong = 0; cout.setf(ios::fixed); cout.precision(2); srand((unsigned)time(NULL)); float answer,write=0.00; int choice=1; while (choice) { DWORD dwStart; DWORD dwEnd; DWORD useTime; // 使用GetTickCount（）来获取时间 cout << "请输入答案。(小数精确到后2位！)" << endl; answer = Practice(); dwStart = GetTickCount(); cin >> write; dwEnd = GetTickCount(); useTime = dwEnd - dwStart; cout << "答题时间为："<< useTime/1000 <<"s"<< endl; if (write == answer) { right++; cout << "回答正确。" <<endl <<" 回答问题总分为 "<<++count<<" 回答正确分数为 "<< right<<" 错误分数为 "<<wrong<< endl; } else { wrong++; cout << "回答错误。" << endl << " 回答问题总分为 " << ++count << " 回答正确分数为 " << right << " 错误分数为 " << wrong << endl; }
cout << "继续做题请按1, 退出请按0"<<endl;
cin >> choice;
}
system("pause");
return 0;
} float Practice() { int range; cout << "请输入多少数以内的四则运算："; cin >> range; cout << endl; int a[4] = { 0 }; srand((unsigned)time(NULL));// 根据系统时间生成随机数 for (int i = 0; i < 4; i++) a[i] = (rand() % range) + 1; sort(a,a+4); // 将数组进行升序排列 switch ((rand() % 16) + 1) { case 1: cout << a[0]<< ""<< a[1] <<"=" ; return a[0] * a[1]; case 2: cout << a[0] << "+" << a[1] << "="; return a[0] + a[1]; case 3: cout << a[0] << "-" << a[1] << "="; return a[0] - a[1]; case 4: cout << a[0] << "/" << a[1] << "="; return (a[0] / (a[1]1.0)); case 5: cout << "(" << a[0] << "/" << a[1] << "+" << a[2] << ")" << "" << a[3] << "="; return (a[0] / (a[1] * 1.0) + a[2]) * a[3]; case 6: cout << "(" << a[0] << "-" << a[1] << "+" << a[2] << ")" << "/" << a[3] << "="; return (a[0] - a[1] + a[2]) /a[3]; case 7: cout << a[0] << "/" << a[1] << "+" << a[2] << "" << a[3] << "="; return a[0] / (a[1] * 1.0) + a[2] * a[3]; case 8: cout << a[0] << "+" << a[1] << "+" << a[2] << "" << a[3] << "="; return a[0] + a[1] + a[2] * a[3]; case 9: cout << a[2] << "-" << a[1] << "+" << a[2] << "" << a[3] << "="; return a[2] - a[1] + a[2] * a[3]; case 10: cout << a[0] << "+" << a[1] << "-" << a[2] << "="; return a[0] + a[1] - a[2]; case 11: cout << a[0] << "" << a[1] << "-" << a[2] << "="; return a[0] * a[1] - a[2]; case 12: cout << a[0] << "" << a[1] << "/" << a[2] << "="; return a[0] * a[1] / (a[2]1.0); case 13: cout << a[0] << "" << a[1] << "" << a[2] << "="; return a[0] * a[1] * a[2]; case 14: cout << "(" << a[0] << "-" << a[1] << ")" << "" << " (" << a[2] << "/" << a[3] << ")" << "="; return (a[0] - a[1]) * (a[2] / (a[3]*1.0)); case 15: cout << a[0] << " /" << a[1] << "+" << a[2] << "/" << a[3] << "="; return a[0] / (a[1]*1.0) + a[2] / (a[3]*1.0); case 16: cout << "(" << a[0] << " /" << a[1] << "+" << a[2] << ")" << "/" << a[3] << "="; return (a[0] / (a[1] * 1.0) + a[2]) / (a[3] * 1.0); default: cout << a[0] << "+" << a[1] << "="; return a[0] + a[1];
}
}