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Full Discussion: ANSI C, char to hex conversion
Top Forums UNIX for Dummies Questions & Answers ANSI C, char to hex conversion Post 302242564 by Perderabo on Thursday 2nd of October 2008 08:46:04 AM
Old 10-02-2008
Code:
printf("%02X_",(int)*(buf+c));

Try casting it to unsigned. In an int, the high bit means negative if it is turned on. When you promote a char to a (signed) int, that high bit is extended all the way across to preserve the sign.
 

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LEARN ABOUT PHP

values.h

values.h(3HEAD) 						      Headers							   values.h(3HEAD)

NAME

       values.h, values - machine-dependent values

SYNOPSIS

       #include <values.h>

DESCRIPTION

       This file contains a set of manifest constants, conditionally defined for particular processor architectures.

       The  model  assumed  for  integers  is binary representation (one's or two's complement), where the sign is represented by the value of the
       high-order bit.

       BITS(type)		       The number of bits in a specified type (for example, int).

       HIBITS			       The value of a short integer with only the high-order bit set.

       HIBITL			       The value of a long integer with only the high-order bit set.

       HIBITI			       The value of a regular integer with only the high-order bit set.

       MAXSHORT 		       The maximum value of a signed short integer.

       MAXLONG			       The maximum value of a signed long integer.

       MAXINT			       The maximum value of a signed regular integer.

       MAXFLOAT, LN_MAXFLOAT	       The maximum value of a single-precision floating-point number, and its natural logarithm.

       MAXDOUBLE, LN_MAXDOUBLE	       The maximum value of a double-precision floating-point number, and its natural logarithm.

       MINFLOAT, LN_MINFLOAT	       The minimum positive value of a single-precision floating-point number, and its natural logarithm.

       MINDOUBLE, LN_MINDOUBLE	       The minimum positive value of a double-precision floating-point number, and its natural logarithm.

       FSIGNIF			       The number of significant bits in the mantissa of a single-precision floating-point number.

       DSIGNIF			       The number of significant bits in the mantissa of a double-precision floating-point number.

SEE ALSO

       intro(3) math.h(3HEAD)

SunOS 5.10							    2 Mar 1993							   values.h(3HEAD)
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