AGI Command Reference - Arithmetic Commands

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Arithmetic Commands

By Chris Cromer

Commands that operate on variables.

 

 
increment(n);

The value of the variable Var(n) is incremented by one, i.e.
Var(n) = Var(n)+1. If the value is already 255, it is left unchanged.

decrement(n);

The value of the variable Var(n) is decremented by one, i.e.
Var(n) = Var(n)-1. If the value is 0, it is left unchanged.

assign(n, m);

Variable Var(n) is assigned the value m, i.e. Var(n) = m

assignv(n, m);

Variable Var(n) is assigned the value of Var(m), i.e.
Var(n) = Var(m).

addn(n, m);

The value of variable Var(n) is incremented by m, i.e.
Var(n) = Var(n) + m.

addv(n, m);

The value of variable Var(n) is incremented by the value of Var(m), i.e. Var(n) = Var(n) + m.
[Now what happens in the above two commands on 8-bit overflow: does the result wrap over 0 or stays 255?
I.e. is 250 + 10 == 4 or 250 + 10 == 255?]

subn(n, m);

The value of Var(n) is decremented by m, I.e. Var(n) = Var(n) - m

subv(n, m);

The value of Var(n) is decremented by Var(m), i.e. Var(n) = Var(n) - Var(m).
[Again, what happens when the result must be negative: is
1 - 2 == 255 or 1 - 2 == 0?]

lindirectn(n, m);

Variable Var(i) where i is the value of Var(n) is assigned a value m, i.e. Var(Var(n)) = m.

lindirectv(n, m);

Variable Var(i) where i is the value of Var(n) is assigned the value of Var(m), i.e. Var(Var(n)) = Var(m).

rindirect(n, m);

Variable Var(n) is assigned the value of Var(i) where i is the value of Var(m), i.e. Var(n) = Var(Var(m)).

muln(n, m);

Variable Var(n) is multiplied by m, i.e. Var(n) = Var(n) * m.

mulv(n, m);

Variable Var(n) is multiplied by the value of Var(m), i.e.
Var(n) = Var(n) * Var(m).
[What happens on overflow?]

divn(n, m)

Variable Var(n) is divided by m, i.e. Var(n) = Var(n) / m.

divv(n, m)

Variable Var(n) is divided by the value of Var(m),
i.e. Var(n) = Var(n) / Var(m). [What happens on division by 0?]

random(n, m, k)

Variable Var(k) is assigned a random value in the range between n and m. Now let us consider the commands changing flag values. Remember that a flag can only have a value 0 or 1.

set(n)

flag(n) is set to 1.

set.v(n)

flag(i), where i is the value of var (n), is set to 1. i.e.
flag(var(n)) = 1.

reset(n)

flag(n) is set to 0.

reset.v(n)

flag(i), where i is the value of var (n), is set to 0, i.e.
flag(var(n)) = 0.

toggle(n)

flag(n) toggles its value.

toggle.v(n)

flag(i), where i is the value of var (n), i.e. flag(var(n)), toggles is value.

 

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