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Operators & Expressions

Java Program: Parse Mathematical Expression using Math functions

Expression Evaluated

import java.util.Scanner;
 
public class MathExpressionParser {
    public static void main(String[] args) {
 
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter value of a: ");
        double a = sc.nextDouble();
 
        System.out.print("Enter value of b: ");
        double b = sc.nextDouble();
 
        System.out.print("Enter value of c: ");
        double c = sc.nextDouble();
 
        System.out.print("Enter angle in degrees: ");
        double angle = sc.nextDouble();
 
        // Convert degrees to radians for trigonometric functions
        double radians = Math.toRadians(angle);
 
        // Parsing mathematical expression
        double result = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2))
                        + Math.log(c)
                        + Math.sin(radians);
 
        System.out.printf("\nResult of the expression = %.4f\n", result);
 
        sc.close();
    }
}

 
INPUT :
Enter value of a: 3
Enter value of b: 4
Enter value of c: 10
Enter angle in degrees: 30
 
OUTPUT :
Result of the expression = 6.3026

Explanation

1. Mathematical Expression

• √(a² + b²) → Pythagorean expression
• log(c) → Natural logarithm (base e)
• sin(θ) → Trigonometric sine function

2. Using Math Functions in Java

3. Parsing the Expression

double result = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2))

                + Math.log(c)

                + Math.sin(radians);

• Java evaluates the expression step by step using Math library functions.

4. Output Formatting

System.out.printf("%.4f", result);

• Displays result up to 4 decimal places for accuracy.

✅ Key Concepts Used

✔ Mathematical expressions
✔ Math class functions
✔ Order of operations
✔ Degree-to-radian conversion
✔ Formatted output

📌 Short Exam Answer

This program evaluates a mathematical expression by parsing it into Java Math functions such as sqrt, pow, log, and sin. It demonstrates accurate computation using built-in mathematical methods.