constants_and_pointers.C

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#include <iostream>
int main()
{
    int const constVar1 =42;
    const int constVar2 = 13;
    int variable =11;
 
    const int* pointer = &constVar1;//这个const只是告诉编译器，这个指针指向常变量,并没有限制这个指针变量，指针变量是可以变的,如果给这个指针重新定向，这个const并不会限制指针变量
    std::cout << "the pointer address is  " << pointer << std::endl;
    std::cout << "the pointer points to " << *pointer << std::endl;
 
    pointer = &constVar2;
    std::cout << "the pointer address is  " << pointer << std::endl;
    std::cout << "the pointer points to " << *pointer << std::endl;
 
    pointer = &variable;
    std::cout << "the pointer address is " << pointer << std::endl;
    std::cout << "the pointer points to " << *pointer << std::endl;
 
 
    int aa =11;
    int* const constPointer =&aa; //这个const修复的是指针变量，也就是变量是指向固定的地址
 
    std::cout << "the pointer points to " << constPointer << std::endl;
    std::cout << "the pointer points to " << *constPointer << std::endl;
    aa =99;
    std::cout << "the pointer points to " << constPointer << std::endl;
    std::cout << "the pointer points to " << *constPointer << std::endl;
 
    return 0;
}