C语言复习笔记
C语言复习笔记
Lesson 1: 输入输出
program程序 Operations运算符 expressions表达式
statements语句
理解第一个程序hello.c的各个部分：
12345#include : preprocessor directive 预处理指令main: function 函数int main(): takes no arguments, return an integer 无参数, 返回整型main: .c contains one and only one main function 一个.c文件有且仅有一个main函数printf: print+f: format 格式化输出
%f或者%lf都表示匹配输出double类型的值；但是scanf输入只能使用%lf匹配
如果是输入输出的是long double类型, 对应的格式串是
%Lf.
const double PI; 定义常量,
常量要全大写命名。
% 和 f 中间可以有一些东西.
例如%10.2f这里的点不是小数点,...
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