View Compilation Error

47290_0_19587.cpp: In function `int main()':
47290_0_19587.cpp:6: error: `max' undeclared (first use this function)
47290_0_19587.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
47290_0_19587.cpp:12: error: `c1' undeclared (first use this function)
47290_0_19587.cpp:12: error: `c2' undeclared (first use this function)