C语言相关程序

#include<stdio.h>
#include<process.h>
main()
{
	FILE *fp;
	char ch;
	if((fp=fopen("file1.txt","w"))=NULL)
	{
		printf("can't open file .\n");
		exit(0);
	}
	while((ch=fgetc(fp))!=EOF)
		putchar(ch);
	fclose(fp);
}