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Program to determine the Quadrant of a Complex number

  • Last Updated : 19 May, 2021

Given a complex number in the form of the string str, the task is to determine the quadrant of the cartesian plane in which this complex number lies.

Examples: 

Input: str = “1 + 1i” 
Output: Quadrant 1

Input: str = “0 + 0i” 
Output: Origin

Approach:



The idea is to first find the real and imaginary parts of a complex number. Let’s say the point is (x, iy), then the following table illustrates the position of the point with respect to the coordinates: 

Below is the implementation of the above approach: 

C++




// C++ program to determine the quadrant
// of a complex number
 
#include <bits/stdc++.h>
using namespace std;
 
// Function to determine the quadrant
// of a complex number
void quadrant(string s)
{
    int l = s.length();
    int i;
 
    // Storing the index of '+'
    if (s.find('+') < l) {
        i = s.find('+');
    }
 
    // Storing the index of '-'
    else {
        i = s.find('-');
    }
 
    // Finding the real part
    // of the complex number
    string real = s.substr(0, i);
 
    // Finding the imaginary part
    // of the complex number
    string imaginary = s.substr(i + 1, l - 1);
 
    int x = stoi(real);
    int y = stoi(imaginary);
 
    if (x > 0 and y > 0)
        cout << "Quadrant 1";
 
    else if (x < 0 and y > 0)
        cout << "Quadrant 2";
 
    else if (x < 0 and y < 0)
        cout << "Quadrant 3";
 
    else if (x > 0 and y < 0)
        cout << "Quadrant 4";
 
    else if (x == 0 and y > 0)
        cout << "Lies on positive"
             << " Imaginary axis";
 
    else if (x == 0 and y < 0)
        cout << "Lies on negative"
             << " Imaginary axis";
 
    else if (y == 0 and x < 0)
        cout << "Lies on negative"
             << " X-axis";
 
    else if (y == 0 and x > 0)
        cout << "Lies on positive"
             << " X-axis";
 
    else
        cout << "Lies on the Origin";
}
 
// Driver code
int main()
{
    string s = "5+3i";
    quadrant(s);
    return 0;
}

Java




// Java program to determine the quadrant
// of a complex number
import java.util.*;
 
class GFG{
  
// Function to determine the quadrant
// of a complex number
static void quadrant(String s)
{
    int l = s.length();
    int i;
  
    // Storing the index of '+'
    if (s.contains("+")) {
        i = s.indexOf('+');
    }
  
    // Storing the index of '-'
    else {
        i = s.indexOf('-');
    }
  
    // Finding the real part
    // of the complex number
    String real = s.substring(0, i);
  
    // Finding the imaginary part
    // of the complex number
    String imaginary = s.substring(i + 1, l - 1);
  
    int x = Integer.valueOf(real);
    int y = Integer.valueOf(imaginary);
  
    if (x > 0 && y > 0)
        System.out.print("Quadrant 1");
  
    else if (x < 0 && y > 0)
        System.out.print("Quadrant 2");
  
    else if (x < 0 && y < 0)
        System.out.print("Quadrant 3");
  
    else if (x > 0 && y < 0)
        System.out.print("Quadrant 4");
  
    else if (x == 0 && y > 0)
        System.out.print("Lies on positive"
            + " Imaginary axis");
  
    else if (x == 0 && y < 0)
        System.out.print("Lies on negative"
            + " Imaginary axis");
  
    else if (y == 0 && x < 0)
        System.out.print("Lies on negative"
            + " X-axis");
  
    else if (y == 0 && x > 0)
        System.out.print("Lies on positive"
            + " X-axis");
  
    else
        System.out.print("Lies on the Origin");
}
  
// Driver code
public static void main(String[] args)
{
    String s = "5+3i";
    quadrant(s);
}
}
 
// This code is contributed by Rajput-Ji

Python3




# Python 3 program to determine the quadrant
# of a complex number
 
# Function to determine the quadrant
# of a complex number
def quadrant(s):
    l = len(s)
    # Storing the index of '+'
    if ('+' in s):
        i = s.index('+')
 
    # Storing the index of '-'
    else:
        i = s.index('-')
 
    # Finding the real part
    # of the complex number
    real = s[0:i]
 
    # Finding the imaginary part
    # of the complex number
    imaginary = s[i + 1:l - 1]
 
    x = int(real)
    y = int(imaginary)
 
    if (x > 0 and y > 0):
        print("Quadrant 1")
 
    elif(x < 0 and y > 0):
        print("Quadrant 2")
 
    elif (x < 0 and y < 0):
        print("Quadrant 3")
 
    elif (x > 0 and y < 0):
        print("Quadrant 4")
 
    elif (x == 0 and y > 0):
        print("Lies on positive","Imaginary axis")
 
    elif (x == 0 and y < 0):
        print("Lies on negative","Imaginary axis")
 
    elif (y == 0 and x < 0):
        print("Lies on negative","X-axis")
 
    elif (y == 0 and x > 0):
        print("Lies on positive","X-axis")
 
    else:
        print("Lies on the Origin")
 
# Driver code
if __name__ == '__main__':
    s = "5+3i"
    quadrant(s)
     
# This code is contributed by Surendra_Gangwar

C#




// C# program to determine the quadrant
// of a complex number
using System;
 
class GFG{
   
// Function to determine the quadrant
// of a complex number
static void quadrant(String s)
{
    int l = s.Length;
    int i;
   
    // Storing the index of '+'
    if (s.Contains("+")) {
        i = s.IndexOf('+');
    }
   
    // Storing the index of '-'
    else {
        i = s.IndexOf('-');
    }
   
    // Finding the real part
    // of the complex number
    String real = s.Substring(0, i);
   
    // Finding the imaginary part
    // of the complex number
    String imaginary = s.Substring(i + 1, l - 2 - i);
   
    int x = Int32.Parse(real);
    int y = Int32.Parse(imaginary);
   
    if (x > 0 && y > 0)
        Console.Write("Quadrant 1");
   
    else if (x < 0 && y > 0)
        Console.Write("Quadrant 2");
   
    else if (x < 0 && y < 0)
        Console.Write("Quadrant 3");
   
    else if (x > 0 && y < 0)
        Console.Write("Quadrant 4");
   
    else if (x == 0 && y > 0)
        Console.Write("Lies on positive"
            + " Imaginary axis");
   
    else if (x == 0 && y < 0)
        Console.Write("Lies on negative"
            + " Imaginary axis");
   
    else if (y == 0 && x < 0)
        Console.Write("Lies on negative"
            + " X-axis");
   
    else if (y == 0 && x > 0)
        Console.Write("Lies on positive"
            + " X-axis");
   
    else
        Console.Write("Lies on the Origin");
}
   
// Driver code
public static void Main(String[] args)
{
    String s = "5+3i";
    quadrant(s);
}
}
  
// This code is contributed by sapnasingh4991

Javascript




<script>
// Javascript program
 
// Function to determine the quadrant
// of a complex number
function quadrant(s)
{
    var l = s.length;
    var i =0 ;
   
    // Storing the index of '+'
    if (s.indexOf("+") != -1) {
        i = s.indexOf("+");
    }
   
    // Storing the index of '-'
    else {
        i = s.indexOf("-");
    }
   
    // Finding the real part
    // of the complex number
    var real = s.substr(0, i);
   
    // Finding the imaginary part
    // of the complex number
    var imaginary = s.substr(i + 1, l - 1);
   
    var x = parseInt(real);
    var y = parseInt(imaginary);
   
    if (x > 0 && y > 0)
        document.write("Quadrant 1");
   
    else if (x < 0 && y > 0)
           document.write("Quadrant 2");
   
    else if (x < 0 && y < 0)
           document.write( "Quadrant 3");
   
    else if (x > 0 && y < 0)
          document.write( "Quadrant 4");
   
    else if (x == 0 && y > 0)
        document.write( "Lies on positive"+" Imaginary axis");
   
    else if (x == 0 && y < 0)
        document.write( "Lies on negative"+" Imaginary axis");
   
    else if (y == 0 && x < 0)
        document.write( "Lies on negative"+" X-axis");
   
    else if (y == 0 && x > 0)
        document.write( "Lies on positive"+" X-axis");
   
    else
        document.write( "Lies on the Origin");
}
   
var s = "5+3i";
quadrant(s);
</script>
Output: 
Quadrant 1

 

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