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                # C 程序:計算圓的面積和周長 > 原文: [https://beginnersbook.com/2014/06/c-program-to-calculate-area-and-circumference-of-circle/](https://beginnersbook.com/2014/06/c-program-to-calculate-area-and-circumference-of-circle/) 這里我們編寫一個簡單的 C 程序,根據用戶提供的半徑值計算圓的面積和周長。 公式: ```c 面積 = 3.14 * 半徑 * 半徑 周長 = 2 * 3.14 * 半徑 ``` ## 根據用戶輸入計算面積和周長的程序 要計算面積和周長,我們必須知道圓的半徑。程序將提示用戶輸入半徑,并根據輸入計算值。為簡化起見,我們在程序中將標準`PI`值設為 3.14(常數)。其他詳細信息在下面的示例程序中作為注釋提及。 ```c #include <stdio.h> int main() { int circle_radius; float PI_VALUE=3.14, circle_area, circle_circumf; //Ask user to enter the radius of circle printf("\nEnter radius of circle: "); //Storing the user input into variable circle_radius scanf("%d",&circle_radius); //Calculate and display Area circle_area = PI_VALUE * circle_radius * circle_radius; printf("\nArea of circle is: %f",circle_area); //Caluclate and display Circumference circle_circumf = 2 * PI_VALUE * circle_radius; printf("\nCircumference of circle is: %f",circle_circumf); return(0); } ``` 輸出: ```c Enter radius of circle: 2 Area of circle is: 12.560000 Circumference of circle is: 12.560000 ``` 如果您想要更準確的結果,那么將 PI 值設為`22/7`而不是 3.14,它將為您提供面積和周長的精確值。
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