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Paris_Luo 2003-09-29 12:58:03
auto int a = 10;
int a = 10;

两者有什么区别
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Paris_Luo 2003-09-29
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为什么有时在变量可见域内却跟踪不到这个变量呢--debug时
sad_4978 2003-09-29
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没有本质的区别。
wuxfBrave 2003-09-29
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The auto storage-class specifier declares an automatic variable, a variable with a local lifetime. It is the default storage-class specifier for block-scoped variable declarations.

auto declarator ;
An auto variable is visible only in the block in which it is declared. Declarations of auto variables can include initializers, as discussed in Initialization. Since variables with auto storage class are not initialized automatically, you should either explicitly initialize them when you declare them, or assign initial values to them in statements within the block. The values of uninitialized auto variables are undefined. (A local variable of auto or register storage class is initialized each time it comes in scope if an initializer is given.)

An internal static variable (a static variable with local or block scope) can be initialized with the address of any external or static item, but not with the address of another auto item, because the address of an auto item is not a constant.

Few programmers use the auto keyword in declarations because all block-scoped objects not explicitly declared with another storage class are implicitly automatic. Therefore, the following two declarations are equivalent
qwedcxza 2003-09-29
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基本上没区别,因为默认的变量类型是 auto

Few programmers use the auto keyword in declarations because all block-scoped objects not explicitly declared with another storage class are implicitly automatic. Therefore, the following two declarations are equivalent:
// auto_keyword.cpp
int main()
{
auto int i = 0; // Explicitly declared as auto.
int j = 0; // Implicitly auto.
}

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