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#include<stdio.h>
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#include<conio.h> //包含_getch()函数,可以自动从缓冲区读取一个字符(不需要按回车)
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#include<stdlib.h> //包含随机数函数
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#include<time.h> //包含时间函数
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int main()
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{
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while (true)
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{
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srand(time(NULL)); //time(NULL)读取得到从标准计时点(一般是1970年1月1日午夜)到当前时间的秒数。
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//srand()是随机数发生器的初始化函数
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int x, y, score = 0, count = 0, correctAnswer, currentAnswer, flag;
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//x:前一个数,y:后一个数,score:最终分数,count:答题次数,correntAnswer:正确答案,currentAnswer:当前答案 ,flag:临时量
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char choice,op;
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//choice:存储选择,op:运算符
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system("cls");
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printf("欢迎进入测验,电脑将随机出10道题,每道题有三次作答机会,但每答错一次对应分数就会减少\n");
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printf("按Enter键进入考试,其他键退出");
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choice = _getch();
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if (choice == 13) //Enter键的ascii码
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{
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for (int i = 0; i < 10; i++)
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{
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system("cls"); //清屏
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printf("现在是第%d道题:\n",i + 1);
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x = rand() % 51; //产生0~50的随机数
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flag = rand() % 2; //flag为0或1
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if (flag)
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{
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op = '+';
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}
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else
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{
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op = '-';
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}
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if (op == '+') //当运算符为加时
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{
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y = rand() % (50 - x + 1); //第二个数的范围,满足两数之和小于等于50
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correctAnswer = x + y; //算出正确答案
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printf("%d %c %d = \n", x, op, y);
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}
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else
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{
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y = rand() % (x + 1); //应为第一个数范围为0~50,所以第二个数比第一小就行了
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correctAnswer = x - y; //算出正确答案
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printf("%d %c %d = \n", x, op, y);
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}
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for (int j = 0; j < 3; j++)
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{
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printf("第%d次作答\n", j + 1);
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count++;
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printf("请输入您的答案:");
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scanf("%d", ¤tAnswer);
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if (currentAnswer == correctAnswer)
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{
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printf("恭喜你回答正确!\n");
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system("pause"); //暂停
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if (count == 1)
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{
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score = score + 10;
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count = 0;
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break;
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//初始化count并退出循环
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}
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else if (count == 2)
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{
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score = score + 7;
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count = 0;
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break;
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//初始化count并退出循环
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}
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else if (count == 3)
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{
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score = score + 5;
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count = 0;
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break;
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//初始化count并退出循环
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}
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count = 0; //初始化
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}
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else
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{
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printf("答案错误!\n");
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if (count == 3)
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{
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printf("第%d题的答题次数已用完,即将进入下一题",i + 1);
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count = 0;
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system("pause");
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}
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}
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}
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}
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system("cls");
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printf("答题结束!\n");
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printf("您的分数为%d\n",score);
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printf("按Enter继续测试,其他键退出测试.");
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choice = _getch();
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if (choice != 13)
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return 0;
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}
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else
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{
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return 0;
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}
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}
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}
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