Sams Teach Yourself C in 21 Days

3.BUG BUSTER:Is anything wrong with the following code?

FILE *fp;

int c;

if ( ( fp = fopen( oldname, “rb” ) ) == NULL )

return -1;

while (( c = fgetc( fp)) != EOF )

fprintf( stdout, “%c”, c );

fclose ( fp );

Because of the many possible solutions, answers are not provided for the following

exercises.

4. Write a program that displays a file to the screen.


5. Write a program that opens a file and prints it to the printer (stdprn). The program
   should print only 55 lines per page.


6. Modify the program in exercise 5 to print headings on each page. The headings
   should contain the filename and the page number.


7. Write a program that opens a file and counts the number of characters. The pro-
   gram should print the number of characters when finished.


8. Write a program that opens an existing text file and copies it to a new text file with
   all lowercase letters changed to uppercase and all other characters unchanged.


9. Write a program that opens any disk file, reads it in 128-byte blocks, and displays
   the contents of each block on-screen in both hexadecimal and ASCII formats.


10. Write a function that opens a new temporary file with a specified mode. All tempo-
    rary files created by this function should automatically be closed and deleted when
    the program terminates. (Hint: Use the atexit()library function.)

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