View Compilation Error

0_0_30728704_2171.cpp: In function 'int main()':
0_0_30728704_2171.cpp:49:21: error: 'p' was not declared in this scope
                     p = 1.0 * (a + b + c) / 2;
                     ^
0_0_30728704_2171.cpp:50:21: error: 's' was not declared in this scope
                     s = 1.0 * sqrt(p * (p - a) * (p - b) * (p - c));
                     ^