C程序设计英文课件：复习.ppt

Data Types and sizes Variable Names Names are made up of letters, digits and underscore. The first character must be a letter or underscore. Upper case and lower case letters are distinct. The number limit of characters is not consist, depend on system. （always 8 characters） Keywords like if, else, int, etc., can’t be used. It’s a good habit to choose the name related to the purpose of variable. Type Conversions Type Conversions 2.12 Precedence and order of evaluation 2.12 Precedence and order of evaluation 形式参数与实际参数 形式参数：定义函数时函数名后面括号中的变量名 实际参数：调用函数时函数名后面括号中的表达式 * Chapter 2: Types, Operators and Expressions Variable Names Data Types and Sizes Constants Declarations Arithmetic Operators Relational and Logical Operators Type Conversions Increment and Decrement Operators Bitwise Operators Assignment Operators and Expressions Conditional Expressions Precedence and Order of Evaluation 数据类型 基本类型 构造类型 指针类型 空类型 整型 字符型 实型（浮点型） 单精度型 双精度型 枚举类型 数组类型 结构体类型 共同体类型 Sum, day, M.D.richie, $45, int X,x,Y,y; student_name, student_number, k1,k2,k3 ==? m_eng, m_math,m_elec Rule1: “narrow” to “wide”. For example: float f; char c; f+c; /* value is double type*/ Explicit type conversions can be forced(coerced) in any expression (type-name) expression Example: char c; d=(double)c; Rule1: (type-name) expression (int)(x+y) ; (int)x+y; Left to right | Left to right ^ Left to right Left to right = = != = Left to right = = Left to right Left to right + - Left to right * / % Right Associability ! ~ + - * Left to right ( ) [ ] - . Associability Operators Right to left = += -+ *= /= %= = ^= |= = = Right to left ? : Left to right || Left to right Associativity Operators Chapter 3: Control Flow Statements and Blocks If-Else Else-If Switch Loops - While and For Loops - Do-While Break and Continue Goto and labels Chapter 4: Functions and Program Structure Basics of Functions Functions Returning