随机出100以内的数的加减法运算

//-----------------------------------------------------------------------------// Copyright (c) 2009 eryar All rights reserved.////File : Main.cpp//Date : 2009-04-30 21:46 //Author : [e-mail]////Description: //随机出100以内的数的加减法运算, 通过键盘接收解答,//判断对错, 并返回正确与否文字. 将题目和学生解答保存到文本//文件中.//=============================================================================#include <time.h>#include <fstream>#include <iostream>using namespace std;void Swap(int &, int &);int main(int argc, char *argv[]){boolbFlag=false;charisQuit='N';intiCounter=1;ofstreamoFile("result.txt");// Seed the random number generator with current timesrand((unsigned)time(NULL));intiNumberOne=0;intiNumberTwo=0;intiType=0;// 内容为0,1,用来判断运算类型charcType='+';intiAnswer=0;// The answer student replyed.intiResult=0;// The true result calculated by computer.while (!bFlag) {iNumberOne=rand() % 101;//随机产生0-100中的一个数iNumberTwo=rand() % 101;iType=rand() % 2;//随机产生0或1if (iNumberOne < iNumberTwo) {Swap(iNumberOne, iNumberTwo);}iResult=iType ? (iNumberOne + iNumberTwo) : (iNumberOne - iNumberTwo);cType=iType ? '+' : '-';cout<<iCounter<<". "<<iNumberOne<<cType<<iNumberTwo<<" =";cin>>iAnswer;oFile<<iCounter<<". "<<iNumberOne<<cType<<iNumberTwo<<" = " <<iResult<<"/t"<<iAnswer<<endl;if (iResult == iAnswer) {cout<<"How clever you are!"<<endl;}else {cout<<"What a pity! Come on!"<<endl;}cout<<"Are you sure to quit? (y/n)";cin>>isQuit;if (isQuit == 'y' || isQuit == 'Y') {bFlag = true;}iCounter ++;}oFile.close();// close the open file.return 0;}void Swap(int &a, int &b){intc = 0;c = a;a = b;b = c;}