1 The C Programming language Chapter 1 An Overview of C 32 keywords:(由系统定义,不能重作其它定义) auto break case char const continue default do double else enum extern float for goto if int long register return 682 short signed sizeof static struct switch typedef unsigned union void volatile while
32 keywords ：(由系统定义，不能重作其它定义) auto break case char const continue default do double else enum extern float for goto if int long register return short signed sizeof static struct switch typedef unsigned union void volatile while < The C Programming Language Chapter 1 An Overview of C
1 The C Programming language Chapter 1 An Overview of C statements(语句): Labeled statements( Expression statements( Compound statements( Selection statements( if (expression) statement if (expression) statement else statement switch (expression) statement VBS Iteration while(expression) statement do while(expression) for(expl; exp2: exp3) statement Jump statements( continue, break goto identifier return expression
statements(语句)： Labeled statements(带标号语句) Expression statements(表达式语句) Compound statements(复合语句) Selection statements(选择语句) if (expression) statement if (expression) statement else statement switch (expression) statement Iteration while (expression) statement do while (expression) for (exp1;exp2;exp3) statement Jump statements(跳转语句) continue； break； goto identifier; < return expression; The C Programming Language Chapter 1 An Overview of C