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; }