View Compilation Error

0_0_30188142_6259.cpp: In function 'int main()':
0_0_30188142_6259.cpp:43:14: error: 'p' was not declared in this scope
         scan(p);
              ^
0_0_30188142_6259.cpp:44:14: error: 'x' was not declared in this scope
         scan(x);
              ^