View Compilation Error

0_0_4502604_4345.cpp: In function `int main()':
0_0_4502604_4345.cpp:28: error: `near' undeclared (first use this function)
0_0_4502604_4345.cpp:28: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4502604_4345.cpp:39: error: `gcd' undeclared (first use this function)