文件样例

样例：解题与答题
在一文件里随机生成若干道加减乘除题，读入指定文件，然后在另一文件进行解答
本次只包含一个头文件，两个源文件，两个txt文本

"solve.h"

  # pragma once
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
 
void setQuestion();

void answerQuestion();

"solve.c"

include "solve.h"

void setQuestion()
{
	int num1=0;
	int num2=0;
	
	char oper[]={'+','-','*','/'};
	char ch=0;
	
	FILE* fp=NULL;
	fp=fopen("E:\\c语言之家\\question.txt","w");
	//printf("%p\n",fp);
	if(fp==NULL)
	{
		printf("打开失败");return;
	} 
	srand(time(NULL));
	int i;
	for(i=0;i<50;i++)
	{
		num1=rand()%100+1;
		num2=rand()%100+1;
		ch=oper[rand()%4];
		
		char str[50];
		sprintf(str,"%d%c%d=\n",num1,ch,num2);//读入字符串 
		//printf("%s",str);
		fputs(str,fp);
	}
	
	fclose(fp);
	
}

void answerQuestion()
{
	FILE* fp1=fopen("E:\\c语言之家\\question.txt","r");
	if(fp1==NULL) printf("NO\n");
	FILE* fp2=fopen("E:\\c语言之家\\solution.txt","w");
	if(fp2==NULL) printf("NO\n");
	char buf[50];
	while(fgets(buf,sizeof(buf)-1,fp1))
	{
		
		//printf("%s",buf);
		int num1=0;
		int num2=0;
		char oper;
		sscanf(buf,"%d%c%d=",&num1,&oper,&num2);//数据拆分函数 
		double result;
		switch(oper)
		{
			case '+':
				result=num1+num2;
				break;
			case '-':
				result=num1-num2;
				break;
			case '*':
				result=num1*num2;
				break;
			case '/':
				result=num1*1.0/num2;
				break;
		}
		char str[100];
		sprintf(str,"%d%c%d=%g\n",num1,oper,num2,result);
		//printf("%s",str);
		fputs(str,fp2);
	}
	
	fclose(fp1);
	fclose(fp2);
	printf("OK");
}

main.c

include <stdio.h>

#include <stdlib.h>

int main()
{
	setQuestion();
	answerQuestion();		
}