View Compilation Error

0_0_28570118_27673.cpp: In function 'long long int gcd(long long int, long long int)':
0_0_28570118_27673.cpp:36:26: error: expected ':' before ';' token
     return b?gcd(b,a%b)?a;
                          ^
0_0_28570118_27673.cpp:36:26: error: expected primary-expression before ';' token
0_0_28570118_27673.cpp:36:26: error: expected ':' before ';' token
0_0_28570118_27673.cpp:36:26: error: expected primary-expression before ';' token