#include<stdio.h>
#include<stdlib.h>
void main()
{
    FILE *in,*out;
    char ch,infile[10],outfile[10];
    printf("输入一个读入文件的名字：");
    scanf("%s",infile);
    if(in = fopen(infile,"r") == NULL)                //打开输入文件
    {
        printf("Cannot open this file!\n");
        exit(0);
    }
    printf("输入一个输出文件的名字：");
    scanf("%s",outfile);
        
    if(out = fopen(outfile,"w") == NULL)
    {
        printf("Cannot open this file!\n ");
        exit(0);
    }
    while(!feof(in))                 //如果未遇到输入文件的结束标志
    {
        ch = fgetc(in);
        fputc(ch,out);
        putchar(ch);
    }
    putchar(10);                     //显示完全部字符后换行
    fclose(in);
    fclose(out);
}