Explanation:

Here we are writing a simple C program that calculates the area and circumference of circle based on the radius value PROVIDED by user.

Formula:

Area = 3.14 * radius * radius

Circumference = 2 * 3.14 * radius

Program to calculate Area and Circumference based on user input

To calculate area and circumference we must know the radius of circle. The program will prompt user to enter the radius and based on the input it would calculate the values. To MAKE it simpler we have taken standard PI value as 3.14 (constant) in the program. Other details are mentioned as comments in the below example program.

#include

int MAIN()

{

int circle_radius;

float PI_VALUE=3.14, circle_area, circle_circumf;

//Ask user to enter the radius of circle

printf("\nEnter radius of circle: ");

//Storing the user input into VARIABLE circle_radius

scanf("%d",&circle_radius);

//Calculate and display Area

circle_area = PI_VALUE * circle_radius * circle_radius;

printf("\nArea of circle is: %f",circle_area);

//Caluclate and display Circumference

circle_circumf = 2 * PI_VALUE * circle_radius;

printf("\nCircumference of circle is: %f",circle_circumf);

return(0);

}

Output:

Enter radius of circle: 2

Area of circle is: 12.560000

Circumference of circle is: 12.560000

If you want more accurate results then take PI value as 22/7 instead of 3.14, it would give you the EXACT values of area and circumference.