How to calculate the area of ​​a circle in C language

In C language, the formula for calculating the area of ​​a circle is: Area = πr². The steps are as follows: 1. Declare variables for radius and area. 2. Enter the radius of the circle. 3. Calculate the area area = M_PI radius radius. 4. Print output area.

Calculation of the area of ​​a circle in C language

In C language, you can use formulas to calculate the area of ​​a circle :

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

int main() {
    float radius, area;

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

    // 计算圆的面积
    area = M_PI * radius * radius;

    // 打印结果
    printf("圆的面积：%f\n", area);

    return 0;
}</code>

Detailed explanation:

• #include <stdio.h> and #include <math. h> Contains the necessary header files in the C language.
• main() The function is the entry point of the program.
• declares the variables radius and area, which are used to store the radius and area of ​​the circle respectively.
• Use the printf() function to prompt the user to enter the radius of the circle.
• Use the scanf() function to read the radius value from the user and store it in radius.
• Use the M_PI constant (approximately 3.14159) and the square of radius to calculate the area of ​​the circle and store it in area.
• Finally, use the printf() function to print the calculated area.

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