while (x != y) {
      if (x > y) 
            x = x - y;
      else 
            y = y - x; 
}
return x;

Determining McCabe's Cyclomatic Complexity

Method #1
N = No. of nodes = 7
E = No. of edges = 8
V(G) = E - N + 2 = 8 - 7 + 2 = 3

Method #2
V(G) = Total no. of non overlapping areas + 1 = 2 + 1 = 3

Method #3 V(G) = Total no. of decision statements and loops + 1 = 1 + 1 + 1 = 3