C program to concatenate one file to another file

main()
{
     FILE *fp1,*fp2;
     char c;
     fp1=fopen("sample.txt","a");
     fp2=fopen("hello.txt","r");
     if(fp1==NULL)
     {
         printf("\n file does not exist");
         exit(1);
      }
     if(fp2==NULL)
      {
          printf("\n file does not exist");
       }
    while((c=getc(fp1))!=EOF)
    {
        putc(c,fp2);
     }
   printf("\n second file is concatenated to first file");
  }

OUTPUT:
             second file is concatenated to first file

NOTE:   sample.txt and hello.txt files are already existing files. after executing the program hello.txt file contents are concatenated to hello.txt

   

                       C program to merge two files into third file

                
  C program to create a file and display file contents on to the screen , file handling in c, random access to a file, random handling in file, random file handling in c, random access to a file in C, getc(), putc(), fopen(), fclose(),getw(),putw(), c program to display file contents on to the screen. different typed of modes in files. differentiate between r and r+ mode, w and w+ mode , a and a+ mode.EOF, end of the file.