filecopy.c

来自「C源码集」· C语言 代码 · 共 41 行

#include <stdio.h>

int main ()
{
	char in_name[80], out_name[80];
	/* with win 95 long filenames plus path names,
		80 may not be big enough! */

	FILE *instream, *outstream;
	int ch;

	printf("What is the source file name? ");
	scanf("%79s", in_name);
	/* %79s so only reads 79 chars and doesn't overflow the string
		 in_name is name of array, ie is the address of the first element
		 so don't need &in_name */

	if((instream = fopen(in_name, "r")) == NULL)
	{
		fprintf(stderr, "open of %s for reading failed ", in_name);
		perror("because");
		return 1;
	}

	printf("What is the destination file name? ");
	scanf("%79s", out_name);
	if((outstream = fopen(out_name, "w")) == NULL)
	{
		fprintf(stderr, "open of %s for writing failed ", out_name);
		perror("because");
		return 1;
	}

	while ((ch = fgetc(instream)) != EOF)
		fputc(ch, outstream);

	fclose(instream);          //not strictly essentail but good practice
	fclose(outstream);         // C closes files when it finishes

	return 0;
}