typedef struct{u32 a[prec];} b;

A big integer = ∑a[j]2^{28(prec−1−j)}

prec

number of words in a b

static b s2b(char * s);

converts a decimal numeral to a big integer of type b

void pr(b x)

Prints 51 digits of x.

void addTo(b* x, b* y)

adds y to x.

void subFrm(b* x, b* y)

subtracts y from y.

int div10(b* x)

divides x by 10 and returns remainder.

b sb(int j)

returns big integer with value j.

sz

Length of edge of bit array.

fbex

Fibonacci sz

int less(b*x, b*y)

1 if x<y, 0 otherwise

pats[fbex]

an array of the F(sz) like strings of length sz