#include "stdio.h"
#include "stdlib.h"
#include "time.h"
#include "string.h"
int score=0;
int gcd(int x,int y) //求最大公约数函数	
{
	int r;
	r=x%y;
   	while(r!=0)
   	{
   		x=y;
   		y=r;
   		r=x%y;
   	}
   	return y;
} 
int zhengshu(){//求整数的四则运算 
	int left,mid,right,result,int_number;
	srand((unsigned)time(NULL));
	left=rand()%10;
	mid=rand()%4;
	right=rand()%10;
	printf("%d",left);
	switch(mid)
	{
		case(0):result=left+right;
		printf(" + ");break;
		case(1):result=left-right;	
		printf(" - ");break;
		case(2):result=left*right;
		printf(" ×");break;
		case(3):result=left/right;
		printf(" ÷");break;
	}
	printf("%d =",right);
	scanf("%d",&int_number);
	if(int_number == result)
		{
			printf("回答正确！    下一题：\n");
			score=score+1;	
		}
	else{
			printf("回答错误！    下一题：\n");
		}
}

int fenshu(){//求分数的四则运算 
	int left_x,left_y,mid,right_x,right_y,x,y,GYS,int_number1,int_number2;
	srand((unsigned)time(NULL));
	do{
	left_x=rand()%10+1;
	left_y=rand()%10+1;
	mid=rand()%4;
	right_x=rand()%10+1;
	right_y=rand()%10+1;
	}while(!(left_x<left_y&&right_x<right_y));
	printf("%d/%d",left_x,left_y);
		switch(mid)
		{
			case(0):x=left_x*right_y+left_y*right_x;
					y=left_y*right_y;
			printf(" + ");break;
			case(1):x=left_x*right_y-left_y*right_x;
					y=left_y*right_y;	
			printf(" - ");break;
			case(2):x=left_x*right_x;
					y=left_y*right_y;
			printf(" ×");break;
			case(3):x=left_x*right_y;
					y=left_y*right_x;
			printf(" ÷");break;
		}
		printf("%d/%d =",right_x,right_y);
	GYS=gcd(x,y);
	x=x/GYS;
	y=y/GYS;
	scanf("%d/%d",&int_number1,&int_number2);
	if(int_number1==x&&int_number2==y)
	{
		printf("回答正确！    下一题：\n");
		score=score+1;	
	}
	else{
		printf("回答错误！    下一题：\n");
	}
}
int main(){//主函数——随机调用整数函数和分数函数 
	int h,count;
	printf("请输入题目数？");
	scanf("%d",&count);
	for(int i=0;i<count;i++)
	{
		h=rand()%2;
		if(h==0)
		{zhengshu();}
		else
		{fenshu();}
	}
	printf("正确率为：%lf",score*1.0/count);
}