C Programming & Data Structures: Increment and Decrement Operators in C (Part 1) Topics discussed: 1. Increment and Decrement operators in C language. 2. Pre-increment and Post-increment. 3. Pre-decrement and Post-decrement. 4. rvalue and lvalue. 5. Incrementing the rvalue. 6. lvalue required error in C. 7. Difference between pre and post.