View Compilation Error

0_0_9731814_25178.cpp: In function `void init()':
0_0_9731814_25178.cpp:20: error: `p' undeclared (first use this function)
0_0_9731814_25178.cpp:20: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9731814_25178.cpp:23: error: `pn' undeclared (first use this function)
0_0_9731814_25178.cpp: In function `bool prime(int)':
0_0_9731814_25178.cpp:64: error: `pn' undeclared (first use this function)
0_0_9731814_25178.cpp:64: error: `p' undeclared (first use this function)