math Archives - Page 7 of 8

Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k are missing

I had an interesting job interview experience a while back. The question started really easy: Q1: We have a bag containing numbers 1, ...

April 14, 2022
0 Comments

How can I check for NaN values?

float('nan') represents NaN (not a number). But how do I check for it? 1 18 Use math.isnan: Return True if x is a ...

April 13, 2022
0 Comments

Determine Whether Two Date Ranges Overlap

Given two date ranges, what is the simplest or most efficient way to determine whether the two date ranges overlap? As an example, ...

April 13, 2022
0 Comments

Fastest way to determine if an integer’s square root is an integer

I’m looking for the fastest way to determine if a long value is a perfect square (i.e. its square root is another integer): ...

April 12, 2022
0 Comments

Is floating point math broken?

Consider the following code: 0.1 + 0.2 == 0.3 -> false 0.1 + 0.2 -> 0.30000000000000004 Why do these inaccuracies happen? 3 31

April 9, 2022
0 Comments

1000 * 60 * 60 * 24 * 30 results in a negative number [duplicate]

You are multiplying ints together, and overflow occurs because the maximum integer is 2^31 - 1. Only after the multiplications does it get ...

April 8, 2022
0 Comments

How to round up to the next integer?

No, Math.ceil() won’t work on its own because the problem occurs earlier. a and b are both integers, so dividing them evaluates to an integer which is the floor ...

April 8, 2022
0 Comments

What is the best math library to use with java?

April 7, 2022
0 Comments

Inverse Logistic Function / Reverse Sigmoid Function

April 4, 2022
0 Comments

Division of integers in Java

Converting the output is too late; the calculation has already taken place in integer arithmetic. You need to convert the inputs to double: System.out.println((double)completed/(double)total); Note that you don’t ...

April 4, 2022
0 Comments