14.c

#include <stdio.h>

void main() {
        int maxterms = 1;
        int maxstarter = 1;
        int x;
        for (original = 1; original <=1000000; original++) {
                int x = original;
                int terms = 1;
                while (x != 1) {
                        if (x % 2 == 0) {
                                //x is even
                                x = x/2;
                        }
                        else {
                                //x is odd
                                x = (3 * x) + 1;
                        }
                        terms = terms + 1;
                }
                if (terms > maxterms) {
                        maxstarter = original;
                        maxterms = terms;
                }
                printf("%d gives %d terms\n", original, terms);
        }
        printf("%d gives %d terms\n", maxstarter, maxterms);
}

14.rb

#!/usr/bin/ruby
maxterms = 1
maxstarter = 1
(1..1000000).each do
        |x|
        original = x
        terms = 1
        until x == 1 do
                if x % 2 == 0 then
                        #x is even
                        x = x/2
                else
                        #x is odd
                        x = (3 * x) + 1
                end
                terms = terms + 1
        end
        if terms > maxterms then
                maxstarter = original
                maxterms = terms
        end
        print "#{original} gives #{terms} terms\n"
end
print "#{maxstarter} gives #{maxterms} terms\n"