What is the order of Pemdas in Java?

What is the order of Pemdas in Java?

I'll respond in English this time!

PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction) is a set of rules used to evaluate mathematical expressions in various programming languages, including Java.

In Java, the order of operations follows the standard PEMDAS rules:

Example: 2 + (3 * 4) would evaluate to 2 + 12 because the calculation inside the parentheses (3 * 4) is performed first.

Example: 2 ** 3 would evaluate to 8, while Math.pow(2, 3) would also return 8.

Example: 4 * 5 / 2 would evaluate to 10, because the multiplication is performed first (resulting in 20), and then divided by 2 (yielding 10).

Example: 3 + 2 - 1 would evaluate to 4, because the additions are performed first (resulting in 5), and then subtracted by 1 (yielding 4).

Here's a more complex example that demonstrates the order of operations:

int result = 10 + 3 * 2 - 4 / 2;

To evaluate this expression, we would follow the PEMDAS rules:

The final result is 14.

In summary, when evaluating mathematical expressions in Java (or any programming language that follows PEMDAS), follow these steps:

By following this order of operations, you can ensure that your Java code produces the correct results for mathematical expressions.

What operator is percent in Java?

I'm happy to respond in English for this question!

In Java, the operator used for percentage calculation is the modulus operator (%). Yes, you read that right - the same operator used for calculating remainders when dividing two numbers!

Here's a brief explanation:

Let's say you want to calculate 25% of a number. In Java, you can use the following code:

int originalNumber = 100;
int percentage = 25; // in percentage form
int percentOfOriginalNumber = originalNumber * (percentage / 100); // or originalNumber % (percentage/100) if you prefer the modulus operator!
System.out.println("25% of " + originalNumber + " is: " + percentOfOriginalNumber);

When you run this code, percentOfOriginalNumber will hold the value 25, which is the 25th part of the original number 100.

So, why use the modulus operator for percentage calculations? Well, when you divide a number by another number (e.g., dividing originalNumber by percentage/100), Java will return an integer result if both numbers are integers. To get the decimal part of the result (which is essential for percentage calculations!), you need to perform floating-point division.

Enter the modulus operator! By using %, you can avoid explicit conversion to a floating-point type (double, for example) and keep your code concise:

int percentOfOriginalNumber = originalNumber % ((percentage/100)+1);

In this case, ((percentage/100)+1) is evaluated first, which ensures the correct division by 100 (without losing decimal precision). The remainder of this operation is then calculated using the modulus operator %, giving you the desired percentage value.

So, to summarize:

Now, go forth and calculate those percentages like a pro!