View Compilation Error

0_0_4477472_25425.cpp: In function `void calcu(int)':
0_0_4477472_25425.cpp:16: error: `max' undeclared (first use this function)
0_0_4477472_25425.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4477472_25425.cpp: In function `int main()':
0_0_4477472_25425.cpp:52: error: `max' undeclared (first use this function)