Determine quadrant of Cartesian coordinates (x, y)

Last update on September 18 2025 12:33:35 (UTC/GMT +8 hours)

Write a C program to read the coordinates (x, y) (in the Cartesian system) and find the quadrant to which it belongs (Quadrant -I, Quadrant -II, Quadrant -III, Quadrant -IV).

Note: A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates.
These are often numbered from 1st to 4th and denoted by Roman numerals: I (where the signs of the (x,y) coordinates are I(+,+), II (−,+), III (−,−), and IV (+,−).

Sample Solution:

C Code:

#include <stdio.h>
int main() {
    int x, y;

    // Prompt for user input
    printf("Input the Coordinate(x,y): ");
    printf("\nx: "); 
    scanf("%d", &x);
    printf("y: ");
    scanf("%d", &y);

    // Check which quadrant the point lies in
    if(x > 0 && y > 0) {
        printf("Quadrant-I(+,+)\n");
    } 
    else if(x > 0 && y < 0) {			
        printf("Quadrant-II(+,-)\n");
    } 
    else if(x < 0 && y < 0) {
        printf("Quadrant-III(-,-)\n");
    } 
    else if(x < 0 && y > 0) {
        printf("Quadrant-IV(-,+)\n");
    }

    return 0;
}

Sample Output:

Input the Coordinate(x,y):                                             
x: 25                                                                  
y: 15                                                                  
Quadrant-I(+,+)

Flowchart:

C Programming Flowchart: Find the quadrant to which a coordinate belongs

For more Practice: Solve these Related Problems:

Write a C program to determine whether a given point lies on the X-axis, Y-axis, or in a quadrant.
Write a C program to identify the quadrant of a point in a 2D Cartesian coordinate system and also check if it lies on the origin.
Write a C program to determine the location of a point, indicating if it is on an axis, in a quadrant, or at the origin.
Write a C program to calculate the distance of a point from the origin and then determine the quadrant in which the point lies.

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