83Plus:BCALLs:405D

Synopsis

Unofficial Name: Floor

BCALL Address: 405D

Calculates the floor of the value in OP1, and stores it in OP1. Floor is rounding down to the nearest integer, e.g. floor(3.5) = 3 and floor(-4.0001) = -5.

Inputs

• OP1: Number to take floor of

Outputs

• OP1 contains floor

Destroys

• OP1, OP2

Comments

This BCALL calculates the floor of the value in OP1 by taking the fractional part, reversing its sign, and adding it to the original value.

Example

ld a,3
B_CALL SetXXOP1
B_CALL TimesPt5 ;OP1 is 1.5
B_CALL Floor ;OP1 is now 1