在这个问题中,我对这个看似基本的C方面感到非常困惑.请考虑以下两行代码:
int *ptr;
*ptr = 2;
gcc将发出以下警告:
main.cpp:4:1: warning: data definition has no type or storage class [enabled by default]
*ptr = 2;
^
main.cpp:4:2: warning: type defaults to 'int' in declaration of 'ptr' [enabled by default]
*ptr = 2;
^
main.cpp:4:8: warning: initialization makes pointer from integer without a cast [enabled by default]
*ptr = 2;
^
什么类型ptr被默认,int或int*(如,ptr指针,或int)？如果是这样,这是否意味着ptr指向地址2,还是没有改变？我会认为它已被更改,因为除非您提供ptr有效地址,否则它会崩溃.
int i = 5;
int …