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From: porkchop@invalid.foo (Mike Sanders)
Newsgroups: comp.lang.awk
Subject: Re: 100 Random Single Variable Linear Equations
Date: Fri, 6 Dec 2024 04:51:54 -0000 (UTC)
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Mike Sanders <porkchop@invalid.foo> wrote:

> # algebra.awk: 2024 - Michael Sanders
> #
> # usage: awk -f algebra.awk > solve.txt
>
> [...]

# subtle tweak: every equation unique (no duplicates)...

BEGIN {
    srand() # seed the random number generator

    # keep generating until we have exactly 100 unique equations
    while (u < 100) {
        a = int(rand() * 20) + 1 # random value for 'a' (1 to 20)
        b = int(rand() * 20) + 1 # random value for 'b' (1 to 20)
        c = int(rand() * 50) + 1 # random value for 'c' (1 to 50)

        opc = (rand() < 0.5 ? "*" : "/")      # random operator
        lhs = sprintf("%dx %s %d", a, opc, b) # left-hand side
        rhs = c                               # right-hand side
        equ = lhs " = " rhs                   # full equation

        # store equation in array if it doesn't already exist
        if (!(equ in equations)) {
            equations[equ] = 1 # mark element as 'reserved'...
            u++                # increment u for each unique equation
        }
    }

    # print equations
    for (e in equations) printf("%03d. %s\n\n\n\n\n\n\n\n\n", ++q, e)
}

# eof

-- 
:wq
Mike Sanders