🔵 Day 3 – My First C Program to Calculate Area of a Circle

September 07, 2025

🔵 Day 3 – My First C Program to Calculate Area of a Circle

Today marks another exciting step in my coding journey. After writing simple introductory programs in Python and C, I finally wrote my first program that solves a real problem in C — calculating the area of a circle.

🧩 The Program {}

#include <stdio.h>

int main()

{

Program : C program to find area of circle

Author : Mayur B Gund

Date : 7 Sep 2025

char r; // character for radius

int b; // integer for radius value

scanf("%c\n", &r); // input for character

scanf("%d", &b); // input for radius value

printf("The area of circle \nwith radius %c = %dcm is \n\t: %f sqcm\n\n",

r, b, 3.14 * b * b);

printf("This program calculates area \nof circle with 100 percent\n accuracy\n");

printf("\tNote: Radius should\n be an integer.");

return 0;

}

📌 Output : 🖥

The area of circle

with radius r = 432cm is {r and 432 are user inputs}

: 585999.360000 sqcm

This program calculates area of circle with 100 percent accuracy

Note: Radius should be an integer.

💡 What I Learned Today

How to take inputs from the user using scanf.
Using variables (char + int) together in one program.
Applying a mathematical formula in C.
Formatting output clearly with printf.

🚀 Reflection

Compared to my first two programs, this one feels more practical and powerful. It gave me a sense that I’m moving closer to solving real-world problems with code.

Learning Python 🐍 and C ⚙️ side by side is helping me balance:
Python → simplicity and fast results.
C → strong fundamentals and deeper understanding.

Step by step, I’m building a stronger foundation for my programming journey. 🌟

Area Calculator using C Language

Mayur's Tech Journey