Usage of const and assert

1、const keyword

Use const Decorated variable , Variables will not be modified , Protect variables from being modified , Acts as the umbrella of variables . If you modify the value of the variable , The compiler will report an error .
const int* p = &a;
const Modification is *p, What we're protecting is *p, Make pointer variable p The object pointed to cannot be modified , But it will not limit p Value .
int* const p = &a;
const Modification is p, What we're protecting is p, Do not modify p Value , Can modify pointer variables p Object to point to .

2、assert keyword

assert If the result of the expression in is false , An error will be reported at compile time , Only the result is true , No mistake .
take assert Compared to a warning line , Do not cross the red line , Nothing , If you cross the red line , Will be punished .