The difference between const char*, char const*, char* const

The weather will be fine on Monday, February 1, 2021 [Do not lament the past, do not waste the present, do not fear the future]

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1. const char* and char const* are equivalent

The C++ standard stipulates that constkeywords placed before the type or variable name are equivalent, so const char*and char const*are equivalent.

const char *p;   //same as below
char const *q;  

2. The difference between const char* and char* const

As for const char *psum char* const q, according to the principle of proximity: the former constmodification *pmeans that the content pointed to by the pointer cannot be changed, and the latter constmodification qmeans that the value of the pointer itself cannot be changed.