C Random Numbers

C Random Numbers

In C random numbers are generated using functions from the <stdlib.h> library.
To make results less predictable, we often combine them with time() from <time.h>.

📌 Functions Used

1️⃣ Generate a Simple Random Number

📌 Output will change each run but may repeat patterns because it’s not seeded.

2️⃣ Seeding Random Generator

To get different random values every time, use srand() with time(0).

3️⃣ Generate a Random Number in a Range

Formula:

Example: Random number between 1 and 10:

4️⃣ Generate Multiple Random Numbers

5️⃣ Generate Random Floating-Point Numbers

Random float between 0 and 1:

6️⃣ Random Number Example: Dice Roll

📌 Constants

• RAND_MAX is the maximum value rand() can return.

• It is system-dependent, but usually:

  RAND_MAX = 32767


Summary