Echelon Neuron C Manual de usuario descargar pdf (Pagina 127)

Neuron C Reference Guide 107

low_byte( ) Built-in Function

The low_byte( ) built-in function extracts the lower single-byte value from the

double-byte operand

. This function operates without regard to signedness. See

also high_byte( ), make_long( ), and swap_bytes( ).

Syntax

unsigned short low_byte (unsigned long

);

Example

short b;

long a;

void f(void)

{

a = 258; // Hex value 0x0102

b = low_byte(a); // b now contains the value 0x02

}

make_long( ) Built-in Function

The make_long( ) built-in function combines the

low-byte

and

high-byte

single-

byte values

to make a double-byte value. This function operates without regard

to signedness of the operands. See also high_byte( ), low_byte( ), and

swap_bytes( ).

Syntax

unsigned long make_long (unsigned short

low-byte

unsigned short

high-byte

);

Example

short a, b;

long l;

void f(void)

{

a = 16; // Hex value 0x10

b = -2; // Hex value 0xFE

l = make_long(a, b); // l now contains 0xFE10

l = make_long(b, a); // l now contains 0x10FE

}

max( ) Built-in Function

The max( ) built-in function compares

and

and returns the larger value. The

result

type

is determined by the types of

and

, as shown in Table 30 on page

108.

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