View Compilation Error

0_0_11261452_21650.cpp: In constructor `Digital_Square::Digital_Square(long int)':
0_0_11261452_21650.cpp:20: error: `max' undeclared (first use this function)
0_0_11261452_21650.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11261452_21650.cpp: At global scope:
0_0_11261452_21650.cpp:85: error: `main' must return `int'
0_0_11261452_21650.cpp: In function `int main(...)':
0_0_11261452_21650.cpp:104: error: `max' undeclared (first use this function)