View Compilation Error

0_0_4719269_24069.cpp: In function `int main()':
0_0_4719269_24069.cpp:33: error: `PI' undeclared (first use this function)
0_0_4719269_24069.cpp:33: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4719269_24069.cpp:35: error: `r' undeclared (first use this function)
0_0_4719269_24069.cpp:36: error: expected primary-expression before '}' token
0_0_4719269_24069.cpp:36: error: expected `;' before '}' token