How to express the circumference of a circle in C language

In C language, the formula for the circumference of a circle is circumference = 2 PI radius, where PI is the pi ratio and the radius is the distance from the center of the circle to any point on the circle.

How to express the circumference of a circle in C language

In C language, how to express the circumference of a circle The formula is:

<code>周长 = 2 * PI * 半径</code>

where:

• PI is pi, which is a constant with an approximate value of 3.14159265.
• Radius is the distance from the center of the circle to any point on the circle.

Detailed explanation:

The circumference of a circle refers to the boundary length of the circle. In order to calculate the circumference, we need to know the radius and pi of the circle.

PI (Pi)

PI is an irrational number, which means it cannot be expressed as a fraction or a finite decimal. In C language, it can be represented as the constant M_PI in the math.h library.

Radius

The radius is the distance from the center of the circle to any point on the circle. In C language, radius is usually represented as a double precision floating point number (double).

Calculate the circumference

Multiply the radius by 2 * PI to get the circumference of the circle. Here is a sample code:

<code class="c">#include <stdio.h>
#include <math.h>

int main() {
    double radius;  // 声明半径变量

    printf("请输入圆的半径：");
    scanf("%lf", &radius);  // 输入半径

    double circumference = 2 * M_PI * radius;  // 计算周长

    printf("圆的周长：%.2lf\n", circumference);  // 输出周长

    return 0;
}</code>

The above is the detailed content of How to express the circumference of a circle in C language. For more information, please follow other related articles on the PHP Chinese website!