|89h||FN$SUM||calculate list sum|
|Input||Pointer on stack to floating-point numbers.
Word on stack specifying the number of floats.
|Output||Floating-point result on the stack.|
Returns the sum of the floating-point numbers pointed to by the parameter on the run-time stack at RTA_SP. The number of floats is passed as a word on the stack at RTA_SP+2.
The result is pushed onto the run-time stack, leaving the input parameters intact.
|Example|| The following code calculates the sum
of COUNT floats at TABFLOATS and leaves the result on the stack.
LDD RTA_SP: ;CURRENT RUNTIME STACK POINTER SUBD #4 ;PREPARE TO PUSH 2 WORDS XGDX CPX ALA_FREE ;ENOUGH MEMORY FREE? BCS ERROR1 ;NO STX RTA_SP: ;NEW STACK POINTER LDD #TABFLOATS ;POINT TO TABLE OF FLOATS STD 0,X ;POINTER ON STACK LDD COUNT ;COUNT OF FLOATS AT TABFLOATS STD 2,X ;COUNT ON STACK OS FN$SUM ;SUM ON STACK BCS ERROR2 RTS
|Errors|| 253 - exponent overflow
249 - stack overflow