用C语言编写文本检索程序

#include"stdio.h"

#include"stdlib.h"

main()

{

FILE *fp

char str[80],*p,*head

int n=0

long filelen

loop1: printf("请输入您要用于 *** 作的文件名及其完整路径:\n"升棚)

gets(str)

fp=fopen(str,"rb+")

if(fp==NULL)

{

printf("找不到指定文吵盯则件,要指定新文件吗?(y=是的,要指定新文件\telse=不用了,退出程序)\t")

gets(str)

if((char)tolower((int)str[0])=='y')goto loop1

else exit(0)

}

printf("请输入您要查找并替换的字符(如果输入的字符数量大于1本程序会自动舍去多余的部分)\n")

gets(str)

printf("请输入您要将找到的字符或字符串替换为的字符(自动舍去多余部分)\n")

gets(&str[1])

fseek(fp,0L,2)

filelen=ftell(fp)

fseek(fp,0L,0)

head=(char *)malloc(filelen)

fread(head,filelen,1,fp)

for(p=headp<head+filelen/1Lp++)if(*p==str[0]){*p=str[1]n++}

fseek(fp,0L,0)

fwrite(head,filelen,1,fp)

fclose(fp)

printf("替换则宽已经完成,共替换%d处\n",n)

}

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

int main(void)

{

const char *a = "This is an example of text string with LF"

const char *b = "example"

int i

int rval

for (i = 0i <桐冲 strlen(a) - strlen(b)i++) {

rval = strncmp(a + i, b, strlen(b))

if (!rval) {

printf("局腊歼found!\局轿n")

return 0

}

}

printf("not found!\n")

return 0

}

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