How do you find the 12th prime number using c?

To keep it simple:

Write a main loop that goes through all the numbers, starting with 2, and incrementing one at a time. Determine whether each number is a Prime number. If it is, increment a counter.

To determine whether each number is a prime number, either use an inner loop, or a separate function. Test divisibility of the number "n" by every number from 2 to n-1. If you find a factor, then it is not a prime number.

Note that you can test divisibility by using the "%" operator. For example:

if (number % factor == 0)

// number is divisible by factor

else

// it isn't