How do you generate a random number between [1, n] using a random generator that generates a floating point number between [0.0, 1.0]

Question

Suppose you have a random number generator that generates a random floating point number between [0.0, 1.0), for example drand48 , how can you create a random number generator that generates an integer between [1, n].

Answer 1

Multiply by n , take the word and add 1.

Answer 2

Take the RNG result, multiply by n-1 and add 1.

Answer 3

Example in c:

 long rand(int n) { double rand1 = 0; rand1 = drand48(); rand1 *= n - 1; rand1 += 1; return (long)rand1; } 

Answer 4

I believe that you may have different random number generators.

 Multiply by n, take the int, and add 1.