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Top Forums Programming Logical Error With Type Conversion In C Post 303021964 by Don Cragun on Tuesday 21st of August 2018 03:40:42 PM
Old 08-21-2018
Quote:
Originally Posted by Corona688
Single and double quotes are very different things in C. In C, "A" means a string -- amounting to the array { 'A', '\0' }. And 'A' is just the number 65.



Numbers that large won't fit in your input array. chars are numbers, but their range is only -128 through +127. It'll work fine if you use a separate array of type 'int' output.
The POSIX standard requires that type char in the C language must be an 8-bit type. The C Standard doesn't specify whether type char is signed or unsigned. So the range of values that can be contained in a char is [-128, 127] on some POSIX conforming systems and [0, 255] on others.

On non-POSIX systems, the C standard allows the type char to be wider than 8 bits. On systems that use UTF-16 as the codeset underlying their system character sets, a char would likely be 16-bits wide.
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explain_sprintf_or_die(3)				     Library Functions Manual					 explain_sprintf_or_die(3)

NAME
explain_sprintf_or_die - formatted output conversion and report errors SYNOPSIS
#include <libexplain/sprintf.h> int explain_sprintf_or_die(char *data, const char *format, ...); int explain_sprintf_on_error(char *data, const char *format, ...); DESCRIPTION
The explain_sprintf_or_die function is used to call the sprintf(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_sprintf(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_sprintf_on_error function is used to call the sprintf(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_sprintf(3) function, but still returns to the caller. data The data, exactly as to be passed to the sprintf(3) system call. format The format, exactly as to be passed to the sprintf(3) system call. RETURN VALUE
The explain_sprintf_or_die function only returns on success, see sprintf(3) for more information. On failure, prints an explanation and exits, it does not return. The explain_sprintf_on_error function always returns the value return by the wrapped sprintf(3) system call. EXAMPLE
The explain_sprintf_or_die function is intended to be used in a fashion similar to the following example: int result = explain_sprintf_or_die(data, format, ...); SEE ALSO
sprintf(3) formatted output conversion explain_sprintf(3) explain sprintf(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2010 Peter Miller explain_sprintf_or_die(3)
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