View Compilation Error

570455_0_0_10431.cpp: In function `int main()':
570455_0_0_10431.cpp:7: error: `sum' undeclared (first use this function)
570455_0_0_10431.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
570455_0_0_10431.cpp:7: error: `p2' undeclared (first use this function)
570455_0_0_10431.cpp:7: error: `p1' undeclared (first use this function)
570455_0_0_10431.cpp:7: error: `q' undeclared (first use this function)
570455_0_0_10431.cpp:7: error: `b' undeclared (first use this function)