13-2b.cpp

C程序设计（第3版）程序源代码,提供你最丰富的实际代码

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