标准IO实现文件拷贝实例一

#include

int main(int argc, char *argv[])
{
 FILE *fpr, *fpw;
 char ch;

 if (argc != 3)
 {
  printf("argument is error\n");
  
  return -1;
 }

 if ((fpr = fopen(argv[1], "r")) == NULL)
 {
  printf("open source is error\n");
  return -1;
 }

 printf("file number is %d\n", fpr->_fileno);

 if ((fpw = fopen(argv[2], "w")) == NULL)
 {
  printf("open target is error\n");
  return -1;
 }

 ch = getc(fpr);
 while (ch != EOF)
 {
  fputc(ch, fpw);
  ch = getc(fpr);
 }

 return 0;
}