c言語ファイル操作フローで起こりやすいエラー

#include <stdio.h>
#include <stdlib.h>
int main()
{
    FILE *fp;
    fp=fopen("E:\\Recent Files\\test.txt","r");
    //    w  ，               ，          
    //         ，          
    if (!fp)
    {
       printf ("can't find the files
.");
       exit(1);//      ,          
       system("pause");
    }
    char ch;
    while ((ch=fgetc(fp))!=EOF)
          fputc(ch,stdout);
    
    //while ((ch=fgetc(stdin))!=EOF)
    //      fputc(ch,stdout);
    fclose(fp);
    system("pause");
    return 0;
}

#include <stdio.h>
#include <iostream>
using namespace std;
#include <stdlib.h>
int main()
{
    FILE *fp1,*fp2;
    char buffer[105];
    fp1=fopen("E:\\Recent Files\\test.txt","w");
    //fp2=fopen("E:\\Recent Files\\cherry.txt","w");
    cout<<"11111111fp1="<<fp1<<endl;
    if (NULL==fp1)
    {
       printf ("test cannt open
");
       exit(1);           
    }
    char ch;
    while ((ch=fgetc(stdin))!='
')
    {
          fputc(ch,fp1);
    }
    //fclose(fp1);
    cout<<"222222fp1="<<fp1<<endl;
    system("pause");
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
int main()
{
    FILE *fp1,*fp2;
    char buffer[105];
    fp1=fopen("E:\\Recent Files\\test.txt","w");
    fp2=fopen("E:\\Recent Files\\cherry.txt","w");
    if (NULL==fp1)
    {
       printf ("test cannt open
");
       exit(1);           
    }
    if (NULL==fp2)
    {
       printf ("cherry cannt open
");
       exit(1);           
    }
    char ch;
    while ((ch=fgetc(stdin))!='
')
    {
          fputc(ch,fp1);
    }   
    fclose(fp1); 
    fp1=fopen("E:\\Recent Files\\test.txt","r");
    while ((ch=fgetc(fp1))!=EOF)//while (!feof(fp1))
    {
          fputc(ch,fp2);
    }
    fclose(fp2);
    fp2=fopen("E:\\Recent Files\\cherry.txt","r");
    while ((ch=fgetc(fp2))!=EOF)
    {
          fputc(ch,stdout);
    }
    fclose(fp1);
    fclose(fp2);
    system("pause");
    return 0;
}