View Compilation Error

0_0_9147759_5015.cpp: In function `int main()':
0_0_9147759_5015.cpp:43: error: `hw' undeclared (first use this function)
0_0_9147759_5015.cpp:43: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9147759_5015.cpp:44: error: `pd' undeclared (first use this function)