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.

Examples:

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.

Examples:

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. Examples:
Var(n) = m

assignv(n, m);

Variable Var(n) is assigned the value of Var(m).

Examples:

Var(n) = Var(m).

addn(n, m);

The value of variable Var(n) is incremented by m.

Examples:

Var(n) = Var(n) + m.

addv(n, m);

The value of variable Var(n) is incremented by the value of Var(m).

Examples:
Var(n) = Var(n) + m.

Notes:

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.

Examples:

Var(n) = Var(n) - m

subv(n, m);

The value of Var(n) is decremented by Var(m).

Examples:
Var(n) = Var(n) - Var(m).

Notes:

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.

Examples:

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).

Examples:

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).

Examples:

Var(n) = Var(Var(m)).

muln(n, m);

Variable Var(n) is multiplied by m.

Examples:

Var(n) = Var(n) * m.

mulv(n, m);

Variable Var(n) is multiplied by the value of Var(m).

Examples:
Var(n) = Var(n) * Var(m).

Notes:

What happens on overflow?

divn(n, m)

Variable Var(n) is divided by m.

Examples:

Var(n) = Var(n) / m.

divv(n, m)

Variable Var(n) is divided by the value of Var(m).

Examples:
Var(n) = Var(n) / Var(m).

Notes:

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.

Notes:

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.

Examples:

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,

Examples:

flag(var(n)) = 0.

toggle(n)

flag(n) toggles its value.

toggle.v(n)

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

Examples:

flag(var(n)), toggles is value.

 

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