Question

How to calculate area, diameter and circumference of circle in C

Answer 1

#include <stdio.h>
 
int main(void)
{
	int radius = 3;
	float PI = 3.14f;
 
	float area = PI * radius * radius;
	printf("Area = %.2f\n", area);
 
	float diameter = 2 * radius;
	printf("Diameter = %.2f\n", diameter);
 
	float circumference = 2 * PI * radius;
	printf("Circumference = %.2f\n", circumference);
     
    return 0;
}

 
/* 
run:

Area = 28.26
Diameter = 6.00
Circumference = 18.84

*/

 

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