radix.h File Reference

Defines interface of radix.c functions (do not modify) More...

Go to the source code of this file.

Functions
char	int2char (int radix, int value)
int	char2int (int radix, char digit)
void	int2str (int radix, int value)
int	str2int (int radix)
double	str2frac (int radix)

Detailed Description

This file defines the interface to a C file radix.c that you will complete.

Numbers can be reperesented in various number bases. Humans use base 10. Many times it is convenient to work in other bases. For bases with a radix greater that 10, other characters must be used to represent the "digits" of the human readable form. The characters '0' thru '9' represnt values 0 to 9. The characters 'A' to 'Z' represent values greater that 10 with 'A' representing 10, 'B' representing 11 and so on up to 'Z' representing 35. We will not wory about number bases beyond that. Thus, only '0'..'9' and 'A'..'Z' will ever be used. For convenience, the characters 'a'..'z' are also allowed, and each lower case letter represents the same as its upper case equivalent.

Author

Fritz Sieker, modified by Sanjay Rajopadhye

Function Documentation

int char2int	(	int	radix,
		char	digit
	)

Convert a character representing a digit in the specified base to its value

Parameters

radix	the radix in which you are working (2-36)
digit	the character to convert

Returns

-1 if the digit is not legal for the specified base, otherwise return the the correct value (0 to radix -1).

Todo:

Implement in radix.c based on documentation contained in radix.h

char int2char	(	int	radix,
		int	value
	)

Get the character associated with a value in a specified radix

Parameters

radix	the radix in which you are working (2-36)
value	should be in range 0 to radix - 1

Returns

the character '?' if the value is outside the radix range, otherwise return the character that reprensets that digit. For a radix greater that 10, use the uppercase letters 'A' to 'Z' to represent digits beyond a value of 9.

Todo:

Implement in radix.c based on documentation contained in radix.h

void int2str	(	int	radix,
		int	value
	)

Print the sequence of characters/digits that represents, in the specified radix, the given integer. Your program cannot use arays or strings in C (even if know about them). It should determine the characters to print out using the algorithm of repeated division. The only output function you are allowed to use is putchar() from stdio.h. [Hint: think recursion].

Parameters

radix	the radix in which you are working (2-36)
value	the value to print out.

Todo:

Implement in radix.c based on documentation contained in radix.h

double str2frac

(

int

radix

)

Convert a sequence of characters representing a fractional number in the given radix into the integer value that it represents. The only input function you are allowed to use is getchar() from stdio.h. This function is for extra credit

Parameters

radix

the radix in which you are working (2-36)

Returns

-1 if the value contains an illegal digit for the radix, otherwise return the value.

Todo:

Implement in radix.c based on documentation contained in radix.h

int str2int

(

int

radix

)

Convert a sequence of characters representing a number in the given radix into the integer value that it represents. The only input function you are allowed to use is getchar() from stdio.h.

Parameters

radix

the radix in which you are working (2-36)

Returns

-1 if the value contains an illegal digit for the radix, otherwise return the value.

Todo:

Implement in radix.c based on documentation contained in radix.h