Question

Consider this data sequence: "fish bird reptile reptile bird bird bird mammal fish". There is a CONSECUTIVE REPETITION of length 3 (the three consecutive birds) and aCONSECUTIVE REPETITION of length 2 (the two reptiles). There are also several SINGLETONs of length 1 (a singleton fish, a singleton bird, a singleton mammal, andanother singleton fish).

Write some code that uses a loop to reads in a sequence of words, terminated by the "xxxxx". The code assigns to t the number of CONSECUTIVE REPETITIONS that wereread. (For example, in the above data sequence that value would be 2.) Assume that t has already been declared but not initialized. Assume that there will be at leastone word before the terminating "xxxxx".

Answer 1

I suppose your variable "q" is the counter variable.
It is a little bit confusing, because you didn't initiate the "a" and "d".
May be your code should be like this:

r := a
q := 0
while q < 100 // while q is below 10, the loop will be running and keep running
begin
r := r - d
q := q + 1 // it's important to increase or decrease the "counter variable". So it will not stuck in neverending loop
end

Answer 2

t = 0;
string prev = "xxxxx", current = "", next, last;
cin >> current;
while (current != "xxxxx") {
cin >> next;
    if ((prev == current || current == next) && current != last) {
        t++;
        last = current;
    }   
    prev = current;
    current = next;
}
cout << t;