File: acker1.c

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gcc-riscv64-unknown-elf 8.3.0.2019.08%2Bdfsg-1
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#include <stdio.h>

int acker(int, int);

int
main(void)
{
    int n = acker(3,6);
    if (n != 509)
	printf("acker(3,6) = %d != 509\n", n);
    return(0);
}

int
acker(int x,int y)
{
    if (x==0)
	return(y+1);
    else if (y==0)
	return(acker(x-1,1));
    else
	return(acker(x-1, acker(x, y-1)));
}