Tutorial on Creating a Truly Random Number Generator in C

Introduction

• Presenter: Bucky
• Objective: Learn how to create a truly random number generator in C.
• Important Note: Computers can't generate truly random numbers because they follow a precise algorithm.

Computer Random Number Generators

• Nature of Random Generators:
  • Computers follow a pattern and algorithms.
  • Numbers appear random but are consistent on re-execution due to the same algorithm.
• Problem with Predictability:
  • Predictability is undesirable in scenarios like casino games or any gaming application.

Concept of Seeding

• Purpose: To make random number generation less predictable.
• srand() Function:
  • Use srand() to seed the random number generator.
  • The parameter in srand() influences the algorithm, altering the sequence of numbers.
• Example:
  • Seed with a number (e.g., 12), which changes the output sequence from previous runs.

Achieving True Randomness

• Limitation of Fixed Seed:
  • Using a fixed seed still leads to repeatable sequences across runs.
• Dynamic Seeding with Time:
  • Use the current time as a seed to ensure variability with each execution.
  • Implement with time(NULL):
    • time(NULL) gives the number of seconds since a set date, varying each second.
    • Integrates into the seed, ensuring a new sequence of numbers each time.

Practical Implementation

• Example Execution:
  • Compile and run the program multiple times to see different random sequences.
• Tips for Practice:
  • Create fun programs like a virtual dice roller using true random number generation.

Conclusion

• Recap:
  • Utilize seeding with time to enhance randomness in C programming.
• Action:
  • Practice writing and running programs using these techniques.
• Final Note:
  • Encouragement to subscribe and continue learning.

---

Thank Bucky for the tutorial and insights into creating a random number generator in C.