/*這是我做的一個(gè)10以內(nèi)的數(shù)學(xué)題計(jì)算程序*/
#include<stdio.h>
#include<time.h>
#include<stdlib.h>

int caculate(int a,int b,char c)
{
 int answer;
 if(c=='+')answer=a+b;
else if(c=='-')answer=a-b;
else if(c=='*')answer=a*b;
else answer=a/b;
return answer;
}

void output(int answer)
{
	int d;
	for(;d!=answer;)
	{
	scanf("%d",&d);
	if(d==answer)
		printf("恭喜你！做對了\n");
	else
		printf("很遺憾，你做錯(cuò)了，請重新思考下吧？\n答案是多少？");
	}
}

char sign()
{
	char c;
	srand(time(0));
    c=rand()%100;
    if(c<=25)c='+';
    else if(c>25&&c<50)c='-';
    else if(c>=50&&c<75)c='*';
    else c='/';
	return c;
}
//char change(char c)
//{
 //  if(c=='+')c='+';
 //   else if(c=='-')c='-';
 //   else if(c=='*')c='×';
//    else c='÷';
//return c;
//}


void question(int a,char b,int c)
{
	if (b=='+')
	printf("%d＋%d＝",a,c); 
	if (b=='-')
	printf("%d－%d＝",a,c);
	if (b=='*')
	printf("%d×%d＝",a,c);
	if (b=='/')
	printf("%d÷%d＝",a,c); 
}

void main()
{
	int a,b,answer,d;
	char p,c;
	printf("**********歡迎使用少兒數(shù)學(xué)題程序**********\n");
    for(;p!='n';)
	{

		c=sign();
	if(c=='/')d=1;
		for(;answer>10||answer<0||(d==1&&(answer!=a*b));)
		{
			srand(time(0));
		    a=rand()%10;
		    b=rand()%10;
		    answer=caculate(a,b,c);
		}
	printf("請寫出下面題目的答案 \n");
	question(a,c,b);
	output(answer);
	printf("繼續(xù)嗎？[否]請輸入n，[是]請輸入任意鍵\n");
	scanf("%c",&p);
	getchar();
	answer=11;
	}
}