C++ :: Switch DNA Strand - From Array To Complementary

How do I convert dna from an array to complementary dna.

void print_reverse_complement(const char dna[]) {

the above function will convert DNA to Complementary DNA.. i.e A=T, C =G, G=C and T=A.

The prompt should look like: (asks user for dna sequence and stores into array) (prints back entered sequence)DNA sequence: ATCGGCATA DNA complement: TAGCCGTAT DNA reverse complement: TATGCCGAT

Then how would I do the same thing, but this time the reverse complement?

*Things declared above and in int main()*

const int MAX_NUCLEOTIDES = 100;

char dna[MAX_NUCLEOTIDES];