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;
}