C++ Coding Test Course, Exploring Geometry

In this course, we will cover geometric algorithm problems to prepare for coding tests. Geometric problems involve analyzing the conditions of given points, lines, and planes, and finding the optimal solution through this process. In particular, we will learn how to effectively solve these problems using C++.

Problem Description

Problem: Calculate the distance between the given two points A(x1, y1) and B(x2, y2). The distance formula is as follows:

distance = sqrt((x2 - x1)^2 + (y2 - y1)^2)

Through this problem, we will practice implementing basic mathematical formulas in C++. Additionally, we will learn the importance of data typing and numerical operations through distance calculations when given two points.

Problem Solving Process

1. Input: Receive the coordinates of the two points from the user.

#include 
#include  // Library for using the sqrt function

using namespace std;

int main() {
    double x1, y1, x2, y2;
    
    cout << "Enter the x and y coordinates of point A: ";
    cin >> x1 >> y1;
    cout << "Enter the x and y coordinates of point B: ";
    cin >> x2 >> y2;

    return 0;
}

2. Distance Calculation: Apply the distance formula using the input coordinates.

double distance = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));

3. Output Result: Print the calculated distance on the screen.

cout << "The distance between point A and point B is: " << distance << "." << endl;

Complete Code

Combining the above processes, the final code is as follows:

#include <iostream>
#include <cmath>

using namespace std;

int main() {
    double x1, y1, x2, y2;

    cout << "Enter the x and y coordinates of point A: ";
    cin >> x1 >> y1;
    cout << "Enter the x and y coordinates of point B: ";
    cin >> x2 >> y2;

    double distance = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
    cout << "The distance between point A and point B is: " << distance << "." << endl;

    return 0;
}

Conclusion

In this course, we covered a simple geometric algorithm problem. We implemented a basic algorithm to calculate the distance between two points using C++. In the next lesson, we plan to deal with more complex geometric problems or learn problem-solving methods using various data structures.