Snippet from a file, playing with constants.

const1.cpp

    int i1 = 111;
    int i2 = 222;
    int i3 = 333;
    int i4 = 444;

    // Neither the data nor the pointer are const
    int* a = &i1;

    // Constant data, non-constant pointer
    const int* b = &i2;

    // Constant pointer, non-constant data
    int* const c = &i3;

    // Constant pointer, constant data
    const int* const d = &i4;