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ggidev-ge0_3

NAME

ggidev-sign_3, ggidev-bits_3, ggidev-eq0_3, ggidev-gt0_3, ggidev-ge0_3, ggidev-lt0_3, ggidev-le0_3 - triple-int properties

SYNOPSIS

 #include <ggi/internal/triple-int.h>
 
 int sign_3(unsigned x[3]);
 
 int bits_3(unsigned x[3]);
 
 int eq0_3(unsigned x[3]);
 int gt0_3(unsigned x[3]);
 int ge0_3(unsigned x[3]);
 int lt0_3(unsigned x[3]);
 int le0_3(unsigned x[3]);
 

DESCRIPTION

sign_3 checks the sign of x.

bits_3 counts the number of significant bits of x. I.e. leading zeros in a positive value and leading ones in a negative value are not counted.

eq0_3, gt0_3, ge0_3, lt0_3 and le0_3 tests the relation between x and zero. eq0_3 tests if x is equal to zero, gt0_3 if x is greater than zero, ge0_3 if x is greater than or equal to zero, lt0_3 if x is less than zero and last but not least le0_3 tests if x is less than or equal to zero.

RETURN VALUE

sign_3 returns -1 for negative values, 0 for zero values and 1 for positive values.

bits_3 returns 0 for x equal to 0 or -1, 1 for x equal to 1 and -2, 2 for x equal to 2, 3, -3 and -4 etc.

eq0_3, gt0_3, ge0_3, lt0_3 and le0_3 all returns non-zero if the relation is true, and zero otherwise.

EXAMPLES

Some triple-int tests:

 unsigned x[3];
 
 assign_int_3(x, 5);
 ASSERT(sign_3(x) == 1);
 ASSERT(bits_3(x) == 3);
 ASSERT(!eq0_3(x));
 ASSERT(gt0_3(x));
 ASSERT(ge0_3(x));
 ASSERT(!lt0_3(x));
 ASSERT(!le0_3(x));
 

SEE ALSO

ggidev-triple-int(7), ggidev-assign_int_3(3)