Creating a unique alphanumeric 10-character string

Question

I\'m looking to create a simple short-lived reservation system, and I\'d like to generate confirmation numbers that are

• unique
• random-looking

Answer 1

Some good tips on this question: How do I create a random alpha-numeric string in C++?

I'd avoid including characters like "1", "l", and "O", "0" and "5", "S", and "Z", "2" in your string, to make it easier for customers when they need to read your reservation code over the phone. The algorithm presented at that link should help you do this.