#include "stdafx.h" #include <stdio.h> #include <stdlib.h>  int filelength(FILE *fp); char *readfile(char *path);   int main(void){   char *string;    string=readfile("C:/Users/Joe WANG/Desktop/Data.txt");   printf("數據讀入內存完畢！ /n");   printf("內存中的數據如下:/n%s /n",string);   system("pause");      return 0; }  char *readfile(char *path){   FILE *fp;     int length;   char *ch;      if((fp=fopen(path,"r"))==NULL){     printf("open file %s error./n",path);     exit(0);   }   length=filelength(fp);   ch=(char *)malloc(length);   fread(ch,length,1,fp);   *(ch+length)='/0';      return ch; }  int filelength(FILE *fp){   int num;      fseek(fp,0,SEEK_END);   num=ftell(fp);   fseek(fp,0,SEEK_SET);      return num; }