C#: Find the quadrant in which the coordinate point lies

Last update on August 20 2025 12:38:18 (UTC/GMT +8 hours)

Write a C program to accept a coordinate point in an XY coordinate system and determine in which quadrant the coordinate point lies.

Sample Solution:-

C# Sharp Code:

using System;  // Importing the System namespace

public class Exercise9  // Declaration of the Exercise9 class
{  
    public static void Main()  // Entry point of the program
    {
        int co1, co2;  // Declaration of integer variables co1 and co2 for X and Y coordinates
        Console.Write("\n\n");  // Printing new lines
        Console.Write("Find the quadrant in which the coordinate point lies:\n");  // Displaying the purpose of the program
        Console.Write("------------------------------------------------------");  // Displaying a separator
        Console.Write("\n\n");  // Printing new lines

        Console.Write("Input the value for X coordinate :");  // Prompting user to input the X coordinate
        co1 = Convert.ToInt32(Console.ReadLine());  // Reading the input X coordinate from the user

        Console.Write("Input the value for Y coordinate :");  // Prompting user to input the Y coordinate
        co2 = Convert.ToInt32(Console.ReadLine());  // Reading the input Y coordinate from the user

        if (co1 > 0 && co2 > 0)  // Checking if X and Y coordinates are both positive
            Console.Write("The coordinate point ({0} {1}) lies in the First quadrant.\n\n", co1, co2);  // Printing a message for the first quadrant
        else if (co1 < 0 && co2 > 0)  // Checking if X coordinate is negative and Y coordinate is positive
            Console.Write("The coordinate point ({0} {1}) lies in the Second quadrant.\n\n", co1, co2);  // Printing a message for the second quadrant
        else if (co1 < 0 && co2 < 0)  // Checking if both X and Y coordinates are negative
            Console.Write("The coordinate point ({0} {1}) lies in the Third quadrant.\n\n", co1, co2);  // Printing a message for the third quadrant
        else if (co1 > 0 && co2 < 0)  // Checking if X coordinate is positive and Y coordinate is negative
            Console.Write("The coordinate point ({0} {1}) lies in the Fourth quadrant.\n\n", co1, co2);  // Printing a message for the fourth quadrant
        else if (co1 == 0 && co2 == 0)  // Checking if both X and Y coordinates are zero
            Console.Write("The coordinate point ({0} {1}) lies at the origin.\n\n", co1, co2);  // Printing a message if the coordinates are at the origin
    }
}

Sample Output:

Find the quadrant in which the coordinate point lies:                                                         
------------------------------------------------------
Input the value for X coordinate :0                                                                           
Input the value for Y coordinate :0                                                                           
The coordinate point (0 0) lies at the origin.

Flowchart:

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