Help about fopen,fscanf,fprintf

The book doesn't explain well about fopen, fscanf, and fprintf and now I'm more confused... can somebody give me some URL of C not C++ reference that explains well about this functions and that has examples 2 not a confusing examples. Please help. Thanks in advance.

PHP Code:

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char myString[]="This is sample data.";

fscanf(stdin, "%s" , myString);

/// "stdin" is the keyboard *stream* ///

FILE *file_ptr;  //declare a pointer to a new struct of "FILE" type

file_ptr = fopen("c://myData.txt", "w+");

fprintf(file_ptr, "%s", myString);

fclose(file_ptr); //NEVER FORGET TO DO THIS!! 


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Now look in your computer and find the file and open it.

Check to see if it performed properly.

Better yet, now use fscanf() with file_ptr as the *stream* and print the files contents to your screen using fprintf with "stdout" as the *stream*.
///"stdout" is your computers screen *stream*