Hello, i need to see what is the process to get the answer of next questions:

1. Consider a demand function, q (p), whose own price elasticity is q,p=p , what is the value of the integration constant that guarantees that q (0) = 100?
2. Consider a demand function, q (p), whose own price elasticity is q,p=1 , what is the value of the integration constant that guarantees that q (1) = 100?