c/c++读写文件

#include<stdlib.h>
#include<iostream>
#include<string.h>
using namespace std;
int main(void)
{
FILE *fp, *fp2;
char buf[1024*300];
fp = fopen("in.txt", "rb");
fp2 = fopen("out.txt", "wb+");
fseek(fp, 0, SEEK_END);
int iLen = ftell(fp);
cout<<"iLen: "<<iLen<<endl;
fseek(fp, 0, SEEK_SET);
fread(buf, 1, iLen, fp);
fwrite(buf, 1, iLen, fp2);
fclose(fp);
fclose(fp2);
return 0;
}