文件的创建 内容拷贝 fopen fwrite fseek fread fwrite

利用fopen创建a.txt和b.txt。利用fwrite向a.txt写入“hello world”，接着将a.txt的“hello world”读到缓冲区，再将缓冲区的“hello world”写入到b.txt。

 

#include
#include
#include
#include
#include
#include
#include

int main()
{
 char *buf="Hello World";
 char buffer[11];
 int len;
 FILE *in, *out;
 len = strlen(buf);
 in = fopen("readfile","r+b");
 out = fopen("writefile","r+b");
 fwrite(buf,len+1,1,in);
 fseek(in,0,SEEK_SET);
 while(fread(buffer,len+1,1,in) == 1)
  fwrite(buffer,len+1,1,out);
 fclose(out);
 fclose(in);
 exit(0);
}