大数据查询

#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include<time.h>

char strpath[256] = "kaifang.txt";
char savepath[256] = { 0 };

void showlist( char str[256])
{

	sprintf(savepath, "C:\\%s.txt", str);
	FILE *pf;//文件指针
	pf = fopen(strpath, "r");//读取

	FILE *pfw =fopen(savepath,"w");//写入
	if (pf==NULL || pfw ==NULL)
	{
		printf("文件打开失败");
	} 
	else
	{
		//feof(pf)到了文件末尾返回1，否则返回0
		while (!feof(pf)) //没有到文件末尾就继续
		{
			char readstr[1024] = { 0 };
			fgets(readstr, 1024, pf);//读取一行
			char *p = strstr(readstr, str);//字符串查找
			if (p!=NULL)
			{
				puts(readstr);//打印
				fputs(readstr, pfw);//写入
			}
		}
		fclose(pf);
		fclose(pfw);
	}

}

void main()
{

	char str[256] = { 0 };
	scanf("%s", str);//输入字符串
	printf("你要查询的是%s \n", str);

	time_t start ,end;
	time(&start);

	showlist(str);

	time(&end);
	printf("花了%f秒\n", difftime(end, start));
	system(savepath);
	system("pause");
}