How to resolve the algorithm Parsing/RPN calculator algorithm step by step in the XPL0 programming language
Published on 12 May 2024 09:40 PM
How to resolve the algorithm Parsing/RPN calculator algorithm step by step in the XPL0 programming language
Table of Contents
Problem Statement
Create a stack-based evaluator for an expression in reverse Polish notation (RPN) that also shows the changes in the stack as each individual token is processed as a table.
3 4 2 * 1 5 - 2 3 ^ ^ / +
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Parsing/RPN calculator algorithm step by step in the XPL0 programming language
Source code in the xpl0 programming language
real Stack(10);
int SP;
proc Push(X);
real X;
[Stack(SP):= X; SP:= SP+1];
func real Pop;
[SP:= SP-1; return Stack(SP)];
char Str; real Top; int Token, I;
[Str:= "3 4 2 * 1 5 - 2 3 ^^ ^^ / + ";
SP:= 0;
Format(6, 8);
loop [repeat Token:= Str(0); Str:= Str+1;
until Token # ^ ; \skip space characters
case Token of
^+: [Top:= Pop; Push(Pop+Top)];
^-: [Top:= Pop; Push(Pop-Top)];
^*: [Top:= Pop; Push(Pop*Top)];
^/: [Top:= Pop; Push(Pop/Top)];
^^: [Top:= Pop; Push(Pow(Pop, Top))];
$A0: quit \space with MSB set
other [Push(float(Token-^0))]; \single digit number
ChOut(0, Token);
for I:= 0 to SP-1 do \show stack
RlOut(0, Stack(I));
CrLf(0);
];
]
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