Question

For getting the random numbers I have a function getrand100() which returns a random number in the range of 1-100.

How can I get a random number between ranges 1-20 and 1-200 with the same function?

For 1-20 I can apply:

if(num>=1 && num <=20) then accept else reject

But what should I do for the 1-200 range?

Answer 1

I would propose

1 + getrand100() % 20 

for the first case (20) and

(getrand100()%2)*100 + getrand100()

for the latter (200).