How to Program a Calculator

Reviewed by: David Chen, CFA
David Chen is a Certified Financial Analyst with expertise in programming and financial calculators.

Create a simple calculator that can compute a missing variable given three others. Input values for any three variables and solve for the fourth.

How to Program a Calculator

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Formula

F = P * (V - Q)

Formula Source: Investopedia

Variables:

  • F: The result of the calculation.
  • P: The first input variable.
  • V: The second input variable.
  • Q: The third input variable.

Related Calculators

What is a Calculator?

A calculator is a device used to perform mathematical operations. In programming, a calculator can be built to compute a wide range of functions based on user inputs.

How to Calculate (Example)

  1. Step 1: Enter the values for P, V, and Q.
  2. Step 2: Click “Calculate” to find F.
  3. Step 3: The result will appear below.

Frequently Asked Questions (FAQ)

What is the formula for F? F = P * (V – Q).

What happens if I enter all four variables? The calculator will check for consistency.

Can I calculate with fractions? Yes, decimals and fractions are supported.

Is this calculator accurate? Yes, with small tolerance for rounding errors.

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