也可以使用关键字auto来显示的表明此变量为自动变量:auto int auto_var = 0;,这样做的目的可以是显式覆盖一个外部函数定义的同名变量或者强调该变量的存储类型不可以改变为其他存储方式。auto称为存储类说明符(storage class specifier)。 自动变量具有代码块作用域和空链接,这样只有在变量定义的代码块里才可以通过变...
Variable are stored within CPU registers. 变量请求存储于寄存器 Writing register storage class is simply a request to the compiler so variable may not be stored in CPU registers if they are not free/available.只是请求,未必最后存储寄存器 You will never come to know whether variables are stored wit...
Register Storage Class 使用register声明的变量属于Register Storage Class。Register Storage Class类型的变量可以看作是一种特殊形式的automatic变量,Automatic变量是在内存中分配存储空间的,但是对于大多数的电脑来说,数据的访问速度要小于CPU的计算速度,因此CPU会有一定的空间来缓存少量的数据,以加快访问数据的速度,CPU的...
它指示自动存储持续时间并且没有链接(这是这些类型的声明的默认值),但是另外提示优化器在可能的情况下将该变量的值存储在CPU寄存器中。无论这种优化是否发生,声明的变量register都不能用作地址运算符的参数,不能使用alignas(因为C11),并且register数组不能用于指针转换。 3)static说明符同时指定静态存储持续时间(除非与...
storage_class_specifier data_type variable_name; At most one storage class specifier may be given in a declaration. If no storage class specifier is specified then following rules are used: Variables declared inside a function are taken to be auto. Functions declared within a function are taken...
A variable that you explicitly initialize at the external level. For example,int j = 3;is a definition of the variablej. In variable declarations at the external level (that is, outside all functions), you can use thestaticorexternstorage-class specifier or omit the storage-class specifier ...
You can use any of four storage-class-specifier terminals for variable declarations at the internal level. When you omit the storage-class-specifier from such a declaration, the default storage class is auto. Therefore, the keyword auto is rarely seen in a C program. See Also Reference C St...
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CRecordset::IsFieldDirty Returns nonzero if the specified field in the current record has been changed. CRecordset::IsFieldNull Returns nonzero if the specified field in the current record is null (has no value). CRecordset::IsFieldNullable Returns nonzero if the specified field in the current...