铁道大学练习-阅读以下程序及对程序功能的描述，其中正确的描述是_______。#include<stdio.h&g

阅读以下程序及对程序功能的描述，其中正确的描述是_______。#include<stdio.h>intmain(){FILE*in,*out;charch,infile[10],outfile[10];printf("Entertheinfilename:\n");scanf("%s",infile);printf("Entertheoutfilename:\n");scanf("%s",outfile);if((in=fopen(infile,"r"))==NULL){printf("Cannotopeninfile!\n");exit(0);}if((out=fopen(outfile,"w"))==NULL){printf("Cannotopenoutfile!\n");exit(0);}while(!feof(in))fputc(fgetc(in),out);fclose(in);fclose(out);return0;}