View Compilation Error

0_0_10544340_25526.cpp: In function `int main()':
0_0_10544340_25526.cpp:19: error: `h' undeclared (first use this function)
0_0_10544340_25526.cpp:19: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10544340_25526.cpp:26: error: `mid' undeclared (first use this function)