How to calculate the area and circumference of a circle in c language

C language may be difficult for novices to calculate the area and circumference of a circle. But in fact, as long as you understand the calculation principles of the area and circumference of a circle, it is easy to implement.

In geometry, the area of ​​a circle is equal to πr², and the circumference of a circle is equal to 2πr. The Greek letter π here is a constant approximately equal to 3.14159.

Recommended course: "C Language Tutorial"

Below we will introduce it to you through specific code examples. How to calculate the area and circumference of a circle in C language.

Write a C program to calculate the circumference and area of ​​a circle with a radius of 6 inches.

The code is as follows:

#include <stdio.h> 
int main() {
   int radius;
   float area, perimeter;    
   radius = 6;

   perimeter = 2*3.14*radius;
   printf("圆的周长 = %f 英寸\n", perimeter);
	
	area = 3.14*radius*radius;
	printf("圆的面积 = %f 平方英寸\n", area);

return(0);
}

The calculation result is as follows:

Why is the area of ​​a circle multiplied by the square of the radius? ?

can be shown in the following animation:

This article is about the specific method of calculating the area and circumference of a circle in C language. I hope it will help you if you need Friends help!

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