文件操作（解密加密）

文件加密：

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

void code(char *s)
{
    while(*s)
    {
        (*s)++;
        s++;
    }
}

int main()
{
    char s[1024] = {0};
    FILE *p = fopen("/home/exbot/wangqinghe/C/20190716/file.txt","r");
    FILE *p1 = fopen("/home/exbot/wangqinghe/C/20190716/b.txt","w");
    
    while(!feof(p))
    {
        memset(s,0,sizeof(s));
        fgets(s,sizeof(s),p);
        code(s);
        fputs(s,p1);
    }

    fclose(p);
    fclose(p1);
    return 0;
}

文件解密：

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

void decode(char *s)
{
    while(*s)
    {
        (*s)--;
        s++;
    }
}


int main()
{
    char s[1024] = {0};
    FILE *p = fopen("/home/exbot/wangqinghe/C/20190716/b.txt","r");
    FILE *p1 = fopen("/home/exbot/wangqinghe/C/20190716/a.txt","w");
    
    while(!feof(p))
    {
        memset(s,0,sizeof(s));
        fgets(s,sizeof(s),p);
        decode(s);
        fputs(s,p1);
    }

    fclose(p);
    fclose(p1);
    return 0;
}