CSCI 1300
Introduction to Computing

Fall 1997

Programming Assignment #5

Due Friday, Oct. 3

Write a binary, decimal, hex converter program as follows:

1. Write three functions that read a whole number from the input one character at a time (using getch()) and store it in a variable of type int, and then return the value of the integer. The three functions are:
  • get_decimal() - reads a decimal number.
  • get_binary() - reads a binary number.
  • get_hex() - reads a hexadecimal number.
    • All three of these functions should accept (and print back out) only characters that are valid for that type of number, ignoring all others, and returning as soon as a carriage return (c == 13) is entered. For example, get_binary() should accept 0's and 1's but nothing else, and return the integer when a carriage return is entered.

    2. Write three more functions that take an integer as a parameter and print out the integer.
  • print_decimal() - prints out the integer as a decimal number. print_decimal() may use cout to print the number.
  • print_binary() - prints out the integer as a binary number.
    print_binary() may not call cout or printf to print the number - it should break the number into the individual binary digits and call print_binary_digit() (provided on the class web page) to print them out.
  • print_hex() - prints out the integer as a hexadecimal number.
    print_hex() may not call cout or printf to print the number - it should break the number into the individual hexadecimal digits and call print_hex_digit() (provided on the class web page) to print them out.
    • 3. Write a program that has a while loop that prints out a prompt (like "Command: ") and uses getch() to read what the user types, and the processes the input as follows:
  • If the user types 'b', call get_binary() to read in a binary number, and then call print_decimal(), print_hex(), and print_binary() to print the number out in all three formats.
  • If the user types 'd', call get_decimal() to read in a decimal number, and then call print_decimal(), print_hex(), and print_binary() to print the number out in all three formats.
  • If the user types 'h', call get_hex() to read in a hexadecimal number, and then call print_decimal(), print_hex(), and print_binary() to print the number out in all three formats.
  • If the user types '?', print out a short description of the commands available.
  • If the user types 'q', exit the program.
  • If the user types anything else, ignore it.
    • 4. Bonus part (not worth any extra points, but your output will look better).
  • Write print_binary() and print_hex() so that leading zeros are not printed. Of course, if the number is actually 0 then you will have to print at least one zero.
    • Some useful functions:
  • isdigit() - takes a character c as input and returns 1 (TRUE) if c is a character that represents a decimal digit (0-9) and 0 (FALSE) if not.
  • isxdigit() - takes a character c as input and returns 1 (TRUE) if c is a character that represents a hexadecimal digit (0-9, a-f, A-F).
  • Of course, for binary numbers you can just check if c is '0' or '1'.
  • ctoi() (available on the web page) that takes a single character c and returns the integer value that it represents.