hello-world/源.cpp at master · xzc1017964340/hello-world · GitHub

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#include<stdio.h>
#include<math.h>
#include<windows.h>
#include<time.h>

int right = 0;
int wrong = 0;

void add(){
	int a, b, c;
	a = rand() % 100;
	b = rand() % 100;
	printf("请回答：\n\t\t %d + %d = ", a, b);
	scanf_s("%d", &c);
	if (a + b == c)
	{
		printf("回答正确!\n");
		right++;
	}
	else
	{
		printf("回答错误!\n");
		wrong++;
	}
}

void sub(){
	int a, b, c;
	do{                                              //修改，如果被减数小于减数，则重新取值
		a = rand() % 100;
		b = rand() % 100;
	} while (a<b);
	printf("请回答：\n\t\t %d - %d = ", a, b);
	scanf_s("%d", &c);
	if (a - b == c)
	{
		printf("回答正确!\n");
		right++;
	}
	else
	{
		printf("回答错误!\n");
		wrong++;
	}
}
void mul()
{
	int a, b, c;
	a = rand() % 100;
	b = rand() % 100;
	printf("请回答：\n\t\t %d * %d = ", a, b);
	scanf_s("%d", &c);
	if (a*b == c)
	{
		printf("回答正确!\n");
		right++;
	}
	else
	{
		printf("回答错误!\n");
		wrong++;
	}
}
void div()
{
	int a, b, c;
	do{                                                   //添加条件，如果被除数为0，则重新取值
	a = rand() % 100;
	b = rand() % 100;
	} while (b == 0);
	printf("请回答：\n\t\t %d / %d = ", a, b);
	scanf_s("%d", &c);
	if (a / b == c)
	{
		printf("回答正确!\n");
		right++;
	}
	else
	{
		printf("回答错误!\n");
		wrong++;
	}
}
void main()
{
	srand((unsigned)time(NULL));                               //添加以时间为随机数种子这一操作
	int choise;
	int con = 0;
	printf("\n\t\t\t欢迎进入小学简易四则运算\n\n");
	while (1)
	{
		printf("请选择：\n");
		printf("\t\t\t  加法运算（请输入1）\n");
		printf("\t\t\t  减法运算（请输入2）\n");
		printf("\t\t\t  乘法运算（请输入3）\n");
		printf("\t\t\t  除法运算（请输入4）\n");
		printf("\t\t\t  退出运算（请输入5）\n");
		if (con == 0)
			scanf_s("%d", &choise);
		switch (choise)
		{
		case 1:
			add();
			break;
		case 2:
			sub();
			break;
		case 3:
			mul();
			break;
		case 4:
			div();
			break;
		case 5:
			return;
		}
		printf("\n\t\t\t继续运算？（请输入1）\n");
		printf("\n\t\t\t重新选择？（请输入2）\n");
		printf("\n\t\t\t退出运算？（请输入3）\n");
		scanf_s("%d", &con);
		if (con == 1)
			con = 1;
		else if (con == 2)
			con = 0;
		else if (con == 3)
			break;
		else
			printf("抱歉!，你输入的指令有误!请重新输入!\n");
	}
	printf("您总共完成了 %d 道题\n正确 %d 道\n错误 %d 道\n", right + wrong, right, wrong);
	system("pause");
}