View Compilation Error

0_0_22994251_23810.cpp: In function 'int main()':
0_0_22994251_23810.cpp:10:6: error: 'a' was not declared in this scope
 cin>>a>>b;
      ^
0_0_22994251_23810.cpp:10:9: error: 'b' was not declared in this scope
 cin>>a>>b;
         ^