How to express the circumference of a circle in C language

The formula expressing the circumference of a circle in C language is: 2 π radius, where π is the pi ratio (approximate value 3.14159265), and radius is the radius of the circle. Sample code: define PI 3.14159265 (define π constant) float radius; (declare radius variable) scanf("%f", &radius); (read radius input) float circumference = 2 PI radius; (calculate circle circumference) printf(" The circumference of the circle is: %.2f\n", circumference); (print result)

The representation of the circumference of the circle in C language

In C language, the circumference of a circle can be represented by the formula 2 * π * radius, where:

• π is the pi ratio , is a constant with an approximate value of 3.14159265.
• radius is the radius of the circle.

Sample code

The following C language code calculates and prints the circumference of a circle:

<code class="c">#include <stdio.h>
#define PI 3.14159265  // 定义 π 的近似值

int main() {
    float radius;

    printf("输入圆的半径：");
    scanf("%f", &radius);

    float circumference = 2 * PI * radius;

    printf("圆周长为：%.2f\n", circumference);

    return 0;
}</code>

In the code:

• #define PI 3.14159265 Row definition PI is an approximate value of π.
• float radius declares a floating point variable radius to store the radius.
• scanf("%f", &radius) Reads the radius from user input.
• float circumference = 2 * PI * radius Calculate the circumference of the circle and store it in the circumference variable.
• printf("The circumference of the circle is: %.2f\n", circumference) Print the value of the circumference of the circle.

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