View Compilation Error

0_0_28630906_24517.cpp: In function 'int main()':
0_0_28630906_24517.cpp:52:24: error: 'w' was not declared in this scope
           scanf("%lf",&w);
                        ^
0_0_28630906_24517.cpp:57:13: error: 'i' was not declared in this scope
         for(i=1;i<=tw;i++)
             ^