Classification	Condition
Equilateral	(a=b=c), with positive sides
Isosceles	Exactly two sides are equal, and the triangle is valid
Scalene	All three sides are different, and the triangle is valid
Invalid	The sides cannot form a triangle

UNI111 · Software Engineering · Software Complexity

High-Level Languages

#include <stdio.h>

typedef enum {
    CIRCLE,
    RECTANGLE
} ShapeType;

typedef struct {
    ShapeType type;
    union {
        struct {
            double radius;
        } circle;
        struct {
            double width;
            double height;
        } rectangle;
    } data;
} Shape;

double area(const Shape *shape) {
    switch (shape->type) {
        case CIRCLE:
            return 3.14159 *
                   shape->data.circle.radius *
                   shape->data.circle.radius;

        case RECTANGLE:
            return shape->data.rectangle.width *
                   shape->data.rectangle.height;
    }
    return 0;
}

#include <iostream>
#include <memory>
#include <vector>

class Shape {
public:
    virtual double area() const = 0;
    virtual ~Shape() = default;
};

class Circle : public Shape {
    double radius;

public:
    Circle(double r) : radius(r) {}

    double area() const override {
        return 3.14159 * radius * radius;
    }
};

class Rectangle : public Shape {
    double width, height;

public:
    Rectangle(double w, double h)
        : width(w), height(h) {}

    double area() const override {
        return width * height;
    }
};

UNI111: Introduction to CSE

Software Engineering

Jooyong Yi (UNIST)

Triangle Classification Problem

Questions

Software Engineering provides techniques for

Birth of Software Engineering

Key Questions in Software Engineering

Managing Development Complexity

Software development process

Agile Development

Agile Development

Agile Manifesto

Agile Development

Managing Software Complexity

What languages do machines use?

What languages do machines use?

Assembly Language

Compilers

High-Level Languages

High-Level Languages

High-Level Languages

Software Engineering in the era of AI

Software Development: Past

Software Development: Present and Future

Program Verification

Example Application of Program Verification

Is CSE in Crisis?

Do you like exploring new ideas?