switch statement (C language) - C 中文开发手册 根据整数参数的值执行代码。用于需要根据整数值执行许多代码分支中的一个或多个分支的情况。 句法 开关(表达式)语句 表达-整数类型的任何表达式(char,signed或unsigned integer或枚举) 声明 - 任何陈述(通常是复合陈述)。情况:和默认值:标签允许在声明中,...
The preceding code uses a switch expression (not the same as a switch statement) that tests the declaration pattern. A switch expression begins with the variable, in the preceding code, followed by the keyword. Next comes all the switch arms inside curly braces. The expression makes other refi...
新版?大括号的作用是让若干个statement(语句)形成一个block(语句块),大括号和case语句有什么直接关系? GTA小鸡 吧主 14 大括号表示一个作用域。大括号在switch中的常见使用场景是,case标签后不能定义变量,因此要用大括号形成一个单独作用域。这样写不能编译这样写才可以 收起回复 4楼 2023-10-15 23:20 ...
switch(1) { case 1 : puts("1"); // prints "1", case 2 : puts("2"); // then prints "2" ("fall-through") } switch(1) { case 1 : puts("1"); // prints "1" break; // and exits the switch case 2 : puts("2"); break; } 与所有其他选择和迭代语句一样,switch语句建立...
static_assert statement (C11) switch statement (C) try-except statement (C) try-finally statement (C) while statement (C) Functions (C) C language syntax summary Implementation-defined behavior C/C++ preprocessor reference C runtime library (CRT) reference ...
switch ( expression ) statement labeled-statement: case constant-expression : statement default : statement Remarks A switch statement causes control to transfer to one labeled-statement in its statement body, depending on the value of expression. The values of expression and each con...
用在switch 语句的控制表达式上 整数提升经常和操作数的“平衡”(balancing,后面提到)发生混淆。事实上,整数提升发生在一元操作的过程中,如果二元操作的两个操作数是同样类型的,那么也可以发生在二元操作之上。 由于整数提升,两个类型为 unsigned short 的对象相加的结果总是 signed int 或 unsigned int 类型的;事实...
You can use the break statement to end processing of a particular case within the switch statement and to branch to the end of the switch statement. Without break, the program continues to the next case, executing the statements until a break or the end of the statement is reached. In ...
C checks the expression with each label value, and executes the block in front of the first match. Each case block has a break as the last statement. The break statement takes the control out of the scope of the switch construct.
注意: 上表中常量是指,全局作用域下,const 修饰的基本数据类型、枚举、字符串类型的变量,不包括数组、结构体和联合体。 上表中变量是指除常量定义以外的其他变量,均使用小驼峰风格。 建议1.1 作用域越大,命名应越精确 C与 C++ 不同,没有名字空间,没有类,所以全局作用域下的标识符命名要考虑不要冲突。 对于...