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Full Discussion: Help with understanding ( int, char, long, short, signed, unsigned etc.... )
Top Forums Programming Help with understanding ( int, char, long, short, signed, unsigned etc.... ) Post 302532661 by jim mcnamara on Tuesday 21st of June 2011 04:14:31 PM
Old 06-21-2011
Each integer datatype (includes char) has a range of values that it can work with.
Variables. Data Types. - C++ Documentation

Read the 'fundamental datatypes' section. It explains the range of each type.
Only you know the kind of data your program will use:
character strings == array of char
letter of the alphabet == char
integer numbers == int (long is often the same as int on 32 bit machines)


signed number dpend on whether you will be doing arithmetic operations and
what those are. Basically you should consider using signed variables simple yo avoid confusion: signed variables use a different printf() format specifier from unsigned variables. Keeping every integer as signed (int, long) makes housekeeping easier.

Read /usr/include/limits.h to see what the ranges are on your machine.
This User Gave Thanks to jim mcnamara For This Post:
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LEARN ABOUT HPUX

ultostr

ltostr(3C)																ltostr(3C)

NAME

       ltostr(),  ultostr(),  ltoa(), ultoa() - convert long integers to strings

SYNOPSIS

   Obsolescent Interfaces
DESCRIPTION

	      Convert a signed long integer to the corresponding string
			     representation in the specified base.  The argument base must be between 2 and 36, inclusive.

	      Convert an unsigned long integer to the corresponding string
			     representation in the specified base.  The argument base must be between 2 and 36, inclusive.

	      Convert a signed long integer to the corresponding base 10
			     string representation, returning a pointer to the result.

	      Convert an unsigned long integer to the corresponding base 10
			     string representation, returning a pointer to the result.

       These functions are smaller and faster than using for simple conversions (see printf(3S)).

   Obsolescent Interfaces
       convert long integers to strings.

ERRORS

       If the value of base is not between 2 and 36, and return NULL and set the external variable to ERANGE.

WARNINGS

       The return values for and point to data whose content is overwritten by subsequent calls to these functions by the same thread.

       and  are  obsolescent interface supported only for compatibility with existing DCE applications. New multi-threaded applications should use
       and

AUTHOR

       and were developed by HP.

SEE ALSO

       strtol(3C), printf(3S), thread_safety(5).

																	ltostr(3C)
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