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Problem of the Day

Problem:

Consider the following code segment.

int a = (int) (Math.random() * 3 + 2);
for (int i = 1; i <= a; i++)
{
    int b = (int) (Math.random() * 2 + 4);
    for (int j = 2; j <= b; j++)
    {
        System.out.print("r");
    }
}

What is the maximum number of times the letter "r" will be printed?

  1. 16 times
  2. 20 times
  3. 25 times
  4. 30 times

Show solution:

The correct answer is a. The maximum number of times the outer i loop will run is four times (going from 1, inclusive to the maximum random value of 4, inclusive), and the maximum number of times the inner j loop can run is four times (going from 2, inclusive, to a maximum random value of 5, inclusive). Thus, the minimum number of times "r" will be printed is 4 × 4 = 16.