View Compilation Error

0_0_36087997_30609.cpp: In function 'int main()':
0_0_36087997_30609.cpp:4:10: error: 'a' was not declared in this scope
     cin>>a>>b;
          ^
0_0_36087997_30609.cpp:4:13: error: 'b' was not declared in this scope
     cin>>a>>b;
             ^