Lab 17: Triangle Study Note - Edubirdie

University:
California State University, Northridge
Course:
COMP 110 | Introduction to Algorithms and Programming and Lab
Academic year:

2023
Views:

83

Pages:

3
Author:

S Kim

Triangle - Side1 : double - Side2 : double - Side3 : double + Triangle(s1 : double, s2 : double, s3: double) + setSide1(side : double) : void + setSide2(side : double) : void + setSide3(side : double) : void + getSide1() : double + getSide1() : double + getSide1() : double + getArea() : double + getPerimeter() : double 1) The constructor should check to see if we have a valid triangle. If not valid, set the three sides to 0.0. 2) set methods should check to see if we have a valid triangle. If not valid, do not change the value of the given side. A triangle is valid if the sum of its two sides is greater than the third side. If the three sides are a, b, and c, then three conditions should be met. 1.a + b > c 2.a + c > b 3.b + c > a 2) The formula for computing the area of a triangle is s = (side1 + side2 + side3)/2; area = s(s − side1)(s − side2)(s − side3) public class Triangle { private double side1; private double side2; private double side3; // Constructor public Triangle(double s1, double s2, double s3) { if (isValidTriangle(s1, s2, s3)) { this.side1 = s1; this.side2 = s2; this.side3 = s3; } else { // If not a valid triangle, set sides to 0.0 this.side1 = 0.0; this.side2 = 0.0; this.side3 = 0.0; } } // Set methods with validation public void setSide1(double side) { if (isValidTriangle(side, this.side2, this.side3)) { this.side1 = side; } } public void setSide2(double side) { if (isValidTriangle(this.side1, side, this.side3)) { this.side2 = side; } } public void setSide3(double side) { if (isValidTriangle(this.side1, this.side2, side)) { this.side3 = side; } } // Get methods public double getSide1() { return side1; } public double getSide2() { return side2; } public double getSide3() { return side3; } // Method to check if the triangle is valid private boolean isValidTriangle(double s1, double s2, double s3) { return (s1 + s2 > s3) && (s1 + s3 > s2) && (s2 + s3 > s1); } // Method to calculate the area of the triangle public double getArea() { double s = (side1 + side2 + side3) / 2; return Math.sqrt(s * (s - side1) * (s - side2) * (s - side3)); } // Method to calculate the perimeter of the triangle public double getPerimeter() { return side1 + side2 + side3; } }

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