View Compilation Error

0_0_1697948_1491.cpp: In function `xnum operator+(xnum, xnum)':
0_0_1697948_1491.cpp:91: error: `Max' undeclared (first use this function)
0_0_1697948_1491.cpp:91: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1697948_1491.cpp: In function `int compare(xnum, xnum)':
0_0_1697948_1491.cpp:171: error: `Max' undeclared (first use this function)
0_0_1697948_1491.cpp: In function `void turn(xnum&, xnum&)':
0_0_1697948_1491.cpp:183: error: `Max' undeclared (first use this function)
0_0_1697948_1491.cpp: In function `xnum operator-(xnum, xnum)':
0_0_1697948_1491.cpp:206: error: `Max' undeclared (first use this function)