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This article is about how to draw a circle in C language. The editor thinks it is very practical, so I hope you can get something after reading this article. Let's take a look at it with the editor.

I. concept description 1.1 Circle

In a plane, a closed curve formed by rotating a circle around a point at a distance of a certain length is called a Circle.

The expression of the circle: (x-a) ²+ (y-b) ²= r ²

In the case of: X ²+ y ²= r ²

1.2 Circle pattern

For reference and understanding only:

Second, the problem presents 1. Problem description

Problem Description:

Draw a hollow circle on the screen with the character "*".

two。 Input and output

Input

None

Output

Display a hollow circle with the character "*"

3. Test sample

Sample Input

None

Sample Output

3. Source code implementation (+ comments) # include#include#include / / defines the mathematical function library because the sqrt function int main () {double y; int x Magi m; for (y = 10 X y > =-10) is used ) {/ / the radius of the circle is 10 / / the column coordinates corresponding to calculation y m2.03 is the screen aspect ratio adjustment factor m = 2.03 * sqrt (100-y*y); / / because the row spacing of the screen is greater than the column spacing, the ellipse for (x = 1position x) will be displayed without adjustment.

< 30-m; x++) printf(" "); //图形左侧空白控制 printf("*"); //左半圆 for( ;x < 30+m; x++) printf(" ");//图形空心部分控制 printf("*\n");//圆的右侧 }}四、输出结果图示 五、简要解释1.实现关键 关键在于在屏幕上用" * " 画一个空心的圆。 我们输出圆可利用图形的左右对称性。 根据圆的方程： x * x + y * y = r * r 可以计算出圆上每一点行和列的对应关系。 2.小说明 m = 2.03 * sqrt(100 - y * y); ① y就是圆的方程中的y ② y对应的列坐标m ③2.03是屏幕纵横比调节系数 为什么要调节屏幕纵横比 ? 因为在电脑上，一般都是行距大于列距，例如可以联系常见的屏幕分辨率1920x1080 1920>

1080 to understand.

④ sqrt is the square function in the math mathematical function library.

What is C language? C language is a process-oriented and abstract general programming language, which is widely used in low-level development. C language can be used to compile and process low-level memory in a simple way.

The above is how to draw a circle in C language. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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