学习C/C++语言:文件的操作

#include<stdio.h>
#include<stdlib.h>
void main(int argc,char *argv[])
{
FILE *in,*out;
if(argc!=3)
{
printf("you forgot to enter a file name\n");
exit(0);
}
if((in=fopen(argv[1],"r"))==NULL)
{
printf("cannot open inflie\n");
exit(0);
}
if((out=fopen(argv[2],"w"))==NULL)
{
printf("cannot open inflie\n");
exit(0);
}
while(!feof(in))
fputc(fgetc(in),out);
fclose(in);
fclose(out);
}