Remote-processing BASIC 52 Manual do Utilizador descarregar pdf (Página 109)

RPBASIC-52 PROGRAMMING GUIDE

2-90

PUSH

Syntax: PUSH expr1 [,expr2,...]

Where: expr is a numeric value

Function: Puts the value of expr to the argument stack. The first value PUSHed and is the last POPped.

Mode: Command, run

Use: PUSH X,Y

Cards: All

DESCRIPTION

PUSH and POP instructions pass values to Basic subroutines. The last value pushed is the last expression in

the PUSH instruction, and is also the first popped off the stack. Multiple expressions can be pushed onto the

argument stack by separating the expressions with commas.

The PUSH and P OP instructions alleviate som e of the problem s of global variables in Basic. The y eliminate

the need to equate subroutine variables to global variables used by the program which called the subroutine.

The stack is cleared when a new program is loaded using EXECUTE.

POP, LD@, ST@

ERROR

A-STACK Attempt to push too many values on the argument stack. Typically no more than 32 values may

be PUSHed onto the stack before it is full.

EXAMPLE

Please refer to the POP example.

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 162 163

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Remote-processing BASIC 52 Manual do Utilizador Página 109