C语言基础 关于文件问题如图所示

Question

/* 编写程序实现2000-2200以内闰年输出。要求：
(1) 编写函数isleap(int)进行闰年判断。
(2) 将结果保存在磁盘文件leapyear.txt中。
(3) 编写函数int copyfile(char *tofilename, char *fromfilename)实现文件复制。*/
#include <stdio.h>
#include <stdlib.h>
#include<string.h>

int main()
{
	int year,t;
	FILE *fp;
	char ch,filename[10],tofilename[30],fromfilename[30];
	printf("请输入年份：\n");
	scanf("%d",&year);
	
	isleap(year);
	
	put_file();
	
	printf("输入输出文件的名字：");
	scanf("%s",tofilename); 
	copyfile(tofilename,filename);
	return 0;
	}

int put_file()
{
    FILE * fp;
    char filename[128];
    printf("请输入文件名：");
    scanf("%s",filename);
    fp = fopen(filename, "w");
    if(fp)
    {
        isleap(fp);
        fclose(fp);
    }
    return 0;
}

void isleap(int year)
{
	if((year%4==0&&year%100==0!=0)||(year%400==0))
		printf("%d是闰年\n",year);
	else
		printf("%d不是闰年\n",year);
}

int copyfile(char *tofilename, char *fromfilename)
{
	FILE *in,*out;
	char ch;
	if((in=fopen(fromfilename,"r"))==NULL)
	{
		printf("无法打开此文件\n");
		exit(0);
	}
	if((out=fopen(tofilename,"w"))==NULL)
	{
		printf("无法打开此文件\n");
		exit(0);
	}
	ch=fgetc(in);
	while(!feof(in))
	{
		fputc(ch,out);
		putchar(ch);
		ch=fgetc(in);
	}
	putchar(10);
	fclose(in);
	fclose(out);
	return 0;
}

将结果放入文件，失败，而且显示出来会乱码，文件复制也是失败

 

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
	FILE * fp;
	int year, i;
	char *filename="leapyear.txt";
    fp = fopen(filename, "w");
    if(fp)
    {
		for(i=2000;i<2200;++i)
		{
			if(isleap(i))
				fprintf(fp, "%d ", i);
		}
        fclose(fp);
    }
	char tofilename[128];
	printf("输入输出文件的名字：");
	scanf("%s",tofilename); 
	copyfile(tofilename,filename);
	return 0;
}

int isleap(int year)
{
	if((year%4==0&&year%100!=0)||(year%400==0))
		return 1;
	return 0;
}

int copyfile(char *tofilename, char *fromfilename)
{
	FILE *in,*out;
	char ch;
	if((in=fopen(fromfilename,"r"))==NULL)
	{
		printf("无法打开此文件\n");
		exit(0);
	}
	if((out=fopen(tofilename,"w"))==NULL)
	{
		printf("无法打开此文件\n");
		exit(0);
	}
	ch=fgetc(in);
	while(!feof(in))
	{
		fputc(ch,out);
		putchar(ch);
		ch=fgetc(in);
	}
	putchar(10);
	fclose(in);
	fclose(out);
	return 0;
}