View Compilation Error

0_0_16229115_27801.cpp: In function 'int main()':
0_0_16229115_27801.cpp:10:13: error: 'a' was not declared in this scope
        cin>>a>>b;
             ^
0_0_16229115_27801.cpp:10:16: error: 'b' was not declared in this scope
        cin>>a>>b;
                ^