Please tell me about preprocessor?

Question

What is preprocessor, types and other things related to preprocesssor.

Answer 1

https://www.sololearn.com/learn/C/2959/?ref=app

Answer 2

https://www.sololearn.com/discuss/1869996/?ref=app
https://www.sololearn.com/discuss/1011103/?ref=app
https://www.sololearn.com/discuss/1899085/?ref=app
https://www.sololearn.com/discuss/1491314/?ref=app
https://www.sololearn.com/discuss/1687933/?ref=app
https://www.sololearn.com/discuss/1685679/?ref=app
https://www.sololearn.com/discuss/83545/?ref=app
https://www.sololearn.com/discuss/1454606/?ref=app
https://www.sololearn.com/discuss/1274750/?ref=app
https://www.sololearn.com/discuss/1634693/?ref=app