C语言中定义一个变量，不给它赋值。它会有值吗？若有是多少？

C语言中定义一个变量，不给它赋值。它会有值吗？若有是多少？

C标准（ISO/IEC 9899:TC2）6.7.8节：
”If an object that has automatic storage duration is not initialized explicitly, its value is
indeterminate. If an object that has static storage duration is not initialized explicitly,
then:
— if it has pointer type, it is initialized to a null pointer;
— if it has arithmetic type, it is initialized to (positive or unsigned) zero;
— if it is an aggregate, every member is initialized (recursively) according to these rules;
— if it is a union, the first named member is initialized (recursively) according to these
rules.“
也就是说，静态变量默认会初始化，值为0；非静态变量默认没有初始化，值未知。事实上，如果使用未初始化的局部变量，编译器一般会给出警告。

你自己试下不就行了,这个不用问的啊

没有值,一般都要初始化,如果不进行初始化,则除了对其赋值或类似的操作,其他操作将会发生错误

定义一个变量， 不给它赋值，这个变量默认＝0

C语言中定义一个变量，不给它赋值。它会有一个不确定的值。具体值会由上次该存储单元被使用时留在其中的值来定。