分享兴趣，传播快乐，增长见闻，留下美好！亲爱的您，这里是LearningYard新学苑。今天小编为大家带来的是C语言（一）：打印与变量。
Share interests, spread happiness,
increase knowledge, and leave good!
Dear you, this is the Learning Yard.
Today, Xiaobian brings you C language (I): printing and variables.
01
第一个程序
（1）环境配置：Dev—C
（2）C语言优势：代码量小、运行速度快、功能强大
C语言劣势：危险性高、开发周期长、可移植性不强
（3）打印Hello world!
01 First procedure
(1) Environment configuration: Dev - C
(2) C language advantages: small code size, fast running speed, powerful functions C language disadvantages: high risk, long development cycle, poor portability
(3) Print Hello world!
02
打印
（1）printf：将指定的内容打印在屏幕上（print format，格式化输出）
（2）\：延续读取，通常使用在一行代码很长的时候
如：
可以得到之上一样的结果
（3）转义字符及其含义
02 Print
(1) printf: print the specified content on the screen (print format, format output)
(2) : continue reading, usually used when a line of code is very long
(3) Escape characters and their meanings
03
变量
（1）变量：确定目标并提供存放空间
（2）变量名：①只能是英文字母和数字或下划线组成
②必须是字母或下划线开头，不能是数字
③区分大小写
④不能使用关键字，如int,if等
（3）数据类型
int：整型
char：字符型
float：单精度浮点型（%.2f 精确到两位小数）
double：双精度浮点型（.9f 11代表数据总宽，9代表精确到小数点后几位）
03 Variable
1) Variable: determine the target and provide storage space
(2) Variable name: ① It can only be composed of English letters and numbers or underscores ② It must start with letters or underscores and cannot be numbers ③ It is case-sensitive ④ It cannot use keywords, such as int, If and other
(3) data type
int: integer
char: character
float: single-precision floating-point type (%. 2f accurate to two decimal places)
double: double-precision floating-point type (% 11.9f 11 represents the total width of the data, 9 represents accurate to several decimal places)
04
代码分享
爱心代码（来源CSDN史迪奇奇龙）：
04 code sharing
love code (source: CSDN Stitch Keelung):
#include<stdio.h>
#include<Windows.h>
int main()
{
system(" color 0c");//设计程序颜色
printf("遇见你是一件很开心的事情,爱你哟！！！\n");//打印文字
float x,y,a;//定义变量x,y,a
for(y=1.5f;y>-1;y-=0.1f)
{
for(x=-1.5f;x<1.5f;x =.05f){
a=x*x y*y-1;
putchar(a*a*a-x*x*y*y*y<0.0f?'x':' ');
}
Sleep(150);//停顿函数（1.5秒钟）
putchar('\n'); //换行
}
return 0;
}
运行结果：
Operation results:
END
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please leave us a message.
Let's meet tomorrow and wish you a happy day!
翻译：百度翻译参考：《零基础入门学习C语言：带你学C带你飞》、哔哩哔哩小甲鱼视频声明：本文由LearningYard新学苑原创，若有侵权请联系删除
文案&排版：易春秀
审核：闫庆红
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