How to resolve the algorithm One of n lines in a file step by step in the XPL0 programming language

Published on 12 May 2024 09:40 PM
#Xpl0

How to resolve the algorithm One of n lines in a file step by step in the XPL0 programming language

Table of Contents

Problem Statement

A method of choosing a line randomly from a file: Is to:

Note: You may choose a smaller number of repetitions if necessary, but mention this up-front. Note: This is a specific version of a Reservoir Sampling algorithm: https://en.wikipedia.org/wiki/Reservoir_sampling

Let's start with the solution:

Step by Step solution about How to resolve the algorithm One of n lines in a file step by step in the XPL0 programming language

Source code in the xpl0 programming language

func One_of_n(N);
int  N, Choice, Line;
[Choice:= 1;
for Line:= 2 to N do
    if Ran(1_000_000) < 1_000_000/Line then Choice:= Line;
return Choice;
];

int Counters(1+10), I, N;
[for I:= 1 to 10 do Counters(I):= 0;
for I:= 1 to 1_000_000 do
    [N:= One_of_n(10);
    Counters(N):= Counters(N)+1;
    ];
for I:= 1 to 10 do
    [IntOut(0, Counters(I));
    ChOut(0, ^ );
    ];
]

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