#include <stdio.h>
#include <string.h>
#define MAX_LEN 800
int main()
{
    char* ch[MAX_LEN];
    memset(ch,0,MAX_LEN);
    FILE* pfile=fopen("FILE.c","r");//打开源文件
    if(NULL==pfile)
        printf("Open file failed\n");
    else
        printf("Open file success\n");
    FILE* cfile=fopen("test.txt","w+");//打开目标文件
    fseek(pfile,0,SEEK_END);
long flen=ftell(pfile);
rewind(pfile);
printf("This file %d bytes\n",flen);
    long read=fread(ch,1,flen,pfile);//读入内存
    printf("Have been read %d bytes\n",read);
    size_t write=fwrite(ch,1,flen,cfile);
   // printf("Have been writen %s bytes\n",write);
    fclose(pfile);
    fclose(cfile);
    return 0;

}

两个问题：
1、如果加入红色代码，程序会停止
2、去掉红色代码，程序运行正常。但是显示读入的字节数（462 bytes）少于源文件（FILE.c)的字节数（495 bytes）.
但是查看test.txt发现实际上写入了527 bytes，并且后面一对空白字符。

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

#define MAX_LEN 800

int main()
{
      char ch[MAX_LEN];
      FILE* pfile,*cfile;
      long flen,read;
      size_t write;

      memset(ch,'\0',MAX_LEN);
      pfile=fopen("FILE.c","r");/*打开源文件 */

      if(NULL==pfile)
            printf("Open file failed\n");
      else
            printf("Open file success\n");

      cfile=fopen("test.txt","w+");/*打开目标文件*/
      fseek(pfile,0,SEEK_END);
      flen=ftell(pfile);
      rewind(pfile);
      printf("This file %d bytes\n",flen);
      read=fread(ch,1,flen,pfile);/*读入内存 */
      printf("Have been read %d bytes\n",read);
      write=fwrite(ch,flen,1,cfile);
      printf("Have been writen %d bytes\n",write);
      fclose(pfile);
      fclose(cfile);
      getch();
      return 0;
}

你的代码是正常运行，但是之写入1个字节
我还是没找到问题所在

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

#define MAX_LEN 800

int main()
{
      char ch[MAX_LEN];
      FILE* pfile,*cfile;
      long flen,read;
      size_t write;

      memset(ch,'\0',MAX_LEN);
      pfile=fopen("FILE.c","r");/*打开源文件 */

      if(NULL==pfile)
            printf("Open file failed\n");
      else
            printf("Open file success\n");

      cfile=fopen("test.txt","w+");/*打开目标文件*/
      fseek(pfile,0,SEEK_END);
      flen=ftell(pfile);
      rewind(pfile);
      printf("This file %d bytes\n",flen);
      read=fread(ch,1,flen,pfile);/*读入内存 */
      printf("Have been read %d bytes\n",read);
      write=fwrite(ch,1,flen,cfile);
      printf("Have been writen %d bytes\n",write);
      fclose(pfile);
      fclose(cfile);
      getch();
      return 0;
}

我实在看不出我们代码有什么区别

靠~~
%d写成%s了