RosettaCodeData/Task/Ackermann-function/GML/ackermann-function.gml

///ackermann(m,n)
var m, n;
m = argument0;
n = argument1;
if(m=0)
    {
    return (n+1)
    }
else if(n == 0)
    {
    return (ackermann(m-1,1,1))
    }
else
    {
    return (ackermann(m-1,ackermann(m,n-1,2),1))
    }