C file read/write

Add content to the file (C language)

An object already exists and content is appended to it:

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# Include <stdio. h>

Int main ()
{
// Read the file content
File * file;

Printf ("opening the file... \ n ");
File = fopen ("C: \ reader.txt", "R ");

If (file = NULL)
{
Printf ("\ n file does not exist! \ N ");
Return 0;
}

Printf ("file opened successfully! \ N ");

Printf ("Read File Content: \ n ");
Char reader;

Reader = fgetc (File );

While (reader! = EOF)
{
Putchar (Reader );
Reader = fgetc (File );
}

Printf ("\ n ");
Fclose (File );

// Append: write characters to the file
File * write;

Write = fopen ("C: \ reader.txt", "");

If (write = NULL)
{

Printf ("file not opened! \ N ");
Return 0;
}

Printf ("\ n enter a new character :");

Char input;

Input = getchar ();

While (input! = '\ N ')
{

Fputc (input, write );

Input = getchar ();

}

Rewind (write );

Fclose (write );

// Read the file again
 
File * file2;

Printf ("Read File Content again: \ n ");
File2 = fopen ("C: \ reader.txt", "R ");

If (file2 = NULL)
{
Printf ("\ n file does not exist \ n ");
Return 0;
}

Char reader2;

Reader2 = fgetc (file2 );

While (reader2! = EOF)
{
Putchar (reader2 );
Reader2 = fgetc (file2 );
}

Printf ("\ n ");
Fclose (file2 );

Return 0;
}

 

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Windows XP

VC ++