RosettaCodeData/Task/Ackermann-function/Elena/ackermann-function.elena

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import extensions;
ackermann(m,n)
{
if(n < 0 || m < 0)
{
InvalidArgumentException.raise()
};
m =>
0 { ^n + 1 }
: {
n =>
0 { ^ackermann(m - 1,1) }
: { ^ackermann(m - 1,ackermann(m,n-1)) }
}
}
public program()
{
for(int i:=0, i <= 3, i += 1)
{
for(int j := 0, j <= 5, j += 1)
{
console.printLine("A(",i,",",j,")=",ackermann(i,j))
}
};
console.readChar()
}