以下为个人学习笔记整理。参考书籍《C++ Primer Plus》
# 分支语句和逻辑表达式
# if 语句
 | int i = 1;  | 
 | if (i > 0){ | 
 | 	  | 
 | }else if (i == 0){ | 
 | 	  | 
 | }else{ | 
 |       | 
 | }  | 
# 逻辑表达式
# 字符函数库 cctype
ispunct(char) :判断字符是否为标点。isdigits(char) :判断字符是否为数字。isalpha(char) :判断是否为字母。isspace(char) :判断是否为空白。- ...
 
# ?: 运算符
 | int result = 5 > 3 ? 1 : 0   | 
# switch 语句
 | int select = 1;  | 
 | switch (select) { | 
 |     case 1: cout << "select = 1" << endl; break;  | 
 |     case 2: cout << "select = 2" << endl; break;  | 
 |     case 3: cout << "select = 3" << endl; break;  | 
 |     case 4: cout << "select = 4" << endl; break;  | 
 |     default: cout << "select not in (1,2,3,4)" << endl;  | 
 | }  |