**Contents**show

## How do you do simple calculations in Java?

**Example: Simple Calculator using Java switch Statement**

- Output 1. …
- Output 2 Choose an operator: +, -, *, or / + Enter first number 21 Enter second number 8 21.0 + 8.0 = 29.0.
- Output 3 Choose an operator: +, -, *, or / – Enter first number 9 Enter second number 3 9.0 – 3.0 = 6.0.

## What are the 4 steps to solving an equation?

We have 4 ways of solving one-step equations: **Adding, Substracting, multiplication and division**. If we add the same number to both sides of an equation, both sides will remain equal. If we subtract the same number from both sides of an equation, both sides will remain equal.

## What does double do in Java?

Java double is used to **represent floating-point numbers**. It uses 64 bits to store a variable value and has a range greater than float type.

## What is area formula?

The most basic area formula is the formula for the area of a rectangle. Given a rectangle with length l and width w, the formula for the area is: **A = lw (rectangle)**. … As a special case, as l = w in the case of a square, the area of a square with side length s is given by the formula: A = s^{2} (square).

## What is the equation of straight line?

The general equation of a straight line is **y = mx + c**, where m is the gradient, and y = c is the value where the line cuts the y-axis. This number c is called the intercept on the y-axis.

## How do you calculate total in Java?

So you simply make this: **sum=sum+num;** for the cycle. For example sum is 0, then you add 5 and it becomes sum=0+5 , then you add 6 and it becomes sum = 5 + 6 and so on. And it is double because you are using division.

## How do you divide in Java?

// Divide a literal by a literal; result is 5 int result = 10 / 2; // Divide a variable by another variable; result is 3 int a = 15; int b = 5; int result = a / b; When dividing integer types, the result is an integer type (see the previous chapter for the exact data type conversions for mathematical operations).

## What is the golden rule for solving equations?

Do unto one side of the equation, what you do to the other!

If we put something on, or take something off of one side, the scale (or equation) is unbalanced. When solving math equations, we must **always keep the ‘scale’ (or equation) balanced so that both sides are ALWAYS equal**.

## What are the rules of equations?

**A General Rule for Solving Equations**

- Simplify each side of the equation by removing parentheses and combining like terms.
- Use addition or subtraction to isolate the variable term on one side of the equation.
- Use multiplication or division to solve for the variable.