Making a circle or any geometrical object by using graphics libraries is not a big deal but if we can create the geometrical object without using any graphics libraries is a little bit tricky.

Today, I made a circle without using any graphics libraries. This can be done by using the two-dimensional array and parametric equation of a circle. Here is the given below code:

#include<iostream> #include<cmath> using namespace std; int main(){ int width = 80, height = 25, radius; char ch; cout << "Enter the radius of circles less than or equal to 12: "; cin >> radius; cout << "\nEnter the character by which you make a circle: "; cin >> ch; // Initialise a two dimensional array char display[width][height]; // Create a empty display for(int i = 0; i < height; i++){ for(int j = 0; j < width; j++){ display[i][j] = ' '; // Every element of display equal to empty }; }; // Create a circle by using parametric equations of circle for(int angle = 0; angle < 360; angle += 1){ // Calculate x and y by using parametic formulas of circle int x = (radius * cos(angle)); int y = (radius * sin(angle)); // Moving cordinates toward center of the display int cx = height/2 + x; int cy = width/2 + y; // Character which made the circle display[cx][cy] = ch; } // Display all elements present in display array for(int i = 0; i < height; i++){ for(int j = 0; j < width; j++){ cout << display[i][j]; }; cout << endl; }; return 0; }

Source:

http://www.mathopenref.com/coordparamcircle.html

http://stackoverflow.com/questions/15072025/c-how-to-draw-a-point-set-a-pixel-without-using-graphics-library-or-any-other

https://github.com/amrit3701/Programs/blob/master/circle.cpp