View Compilation Error

0_0_27141706_2835.cpp: In function 'int main()':
0_0_27141706_2835.cpp:13:12: error: 'n' was not declared in this scope
         if(n==m)
            ^
0_0_27141706_2835.cpp:13:15: error: 'm' was not declared in this scope
         if(n==m)
               ^