View Compilation Error

0_0_30206222_1405.cpp: In function 'int main()':
0_0_30206222_1405.cpp:36:20: error: 'xx' was not declared in this scope
         int pp=gcd(xx,yy);
                    ^
0_0_30206222_1405.cpp:36:23: error: 'yy' was not declared in this scope
         int pp=gcd(xx,yy);
                       ^