LMC advanced

Advanced Challenge 1

Ask the user for a big number, then a small number. Using only a BRP, to loop round, keep subtracting the smaller number until you get past zero, then output the result.

>// Ask the user for a big number, then a small number. Using only a BRP to loop round, keep subtracting the smaller number until you get past zero, then output the result.
        INP
        STA 0
        INP
        STA 1
        LDA 0
        BRP 8
        // how dare you, don't enter a negative number :(
        OUT
        HLT
        SUB 1
        BRP 8
        OUT
// https://asciinema.org/a/s7Ol5SNffDrbBNmI8g2nO6r7P

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Advanced Challenge 2

To declare a constant you need to write it like this:
one DAT 1 (this will give the variable one the value 1 and it will not change).
Using this, add to your previous program to count the number of times you can successfully subtract the smaller number.

>// To declare a constant you need to write it like this:
// one DAT 1 (this will give the variable one the value 1 and it will not change).
// Using this, add to your previous program to count the number of times you can successfully subtract the smaller number.
        INP
        STA 0
        INP
        STA 1
        LDA 0
        BRP 11
        // how dare you, don't enter a negative number :(
        OUT
        LDA 9
        OUT
        HLT
        DAT 1
        SUB 1
        STA 0
        LDA 9
        ADD 10
        STA 9
        LDA 0
        BRP 11
        OUT
        LDA 9
        SUB 10 // this is due to an off-by-one error
        OUT
// https://asciinema.org/a/iK7S5ZcfNq3ly6okXMqBDfGxw

View the playback [asciinema.org]