View Compilation Error

0_0_25629075_25465.cpp: In function 'int gbs(int, int)':
0_0_25629075_25465.cpp:5:19: error: expected ';' before '}' token
 if(b&a){return a*b}
                   ^
0_0_25629075_25465.cpp: In function 'int main()':
0_0_25629075_25465.cpp:25:7: error: 'a' was not declared in this scope
 cout<<a<<endl;
       ^