C program to find circumference, diameter, and area of circle

• We will take the radius as input from the user and store it in the variable named as  radius.
• To calculate diameter, circumference and area. Use diameter = 2 * radius, circumference = 2 * 3.14 * radius and area = 3.14 * radius * radius. respectively
• Now we will print the calculated value on the output screen  diameter, circumference and area respectively

#include <stdio.h>

int main()
{
    float radius, diameter, circumference, area;
    
    /*
     taking input as radius from the user 
     */
    printf("Enter the radius of circle: ");
    scanf("%f", &radius);

    /*
     * Calculatio bys using the formulas 
     */
    diameter = 2 * radius;
    circumference = 2 * 3.14 * radius;
    area = 3.14 * (radius * radius);

    /*
     now output of the calculation 
     */
    printf("Diameter  = %.2f units \n", diameter);
    printf("Circumference  = %.2f units \n", circumference);
    printf("Area o = %.2f sq. units ", area);

    return 0;
}

Output

Enter the radius of circle: 7

Diameter  = 14.00 units 
Circumference  = 43.96 units 
Area o = 153.86 sq. units