C++简明讲解类型转换的使用与作用

#include <stdio.h>
typedef void(PF)(int);
struct Point
{
    int x;
    int y;
};
int main()
{
    int v = 0x12345;
    PF* pf = (PF*)v;
    char c = char(v);
    Point* p = (Point*)v;
    pf(5);
    printf("p->x = %d\n", p->x);
    printf("p->y = %d\n", p->y);
    return 0;
}

#include <stdio.h>
void static_cast_demo()
{
    int i = 0x12345;
    char c = 'c';
    int* pi = &i;
    char* pc = &c;
    c = static_cast<char>(i);
    //pc = static_cast<char*>(pi);
}
void const_cast_demo()
{
    const int& j = 1;
    int& k = const_cast<int&>(j);
    const int x = 2;
    int& y = const_cast<int&>(x);
    //int z = const_cast<int>(x);
    k = 5;
    printf("k = %d\n", k);
    printf("j = %d\n", j);
    y = 8;
    printf("x = %d\n", x);
    printf("y = %d\n", y);
    printf("&x = %p\n", &x);
    printf("&y = %p\n", &y);
}
void reinterpret_cast_demo()
{
    int i = 0;
    char c = 'c';
    int* pi = &i;
    char* pc = &c;
    pc = reinterpret_cast<char*>(pi);
    pi = reinterpret_cast<int*>(pc);
    pi = reinterpret_cast<int*>(i);
    //c = reinterpret_cast<char>(i); 
}
void dynamic_cast_demo()
{
    int i = 0;
    int* pi = &i;
    //char* pc = dynamic_cast<char*>(pi);
}
int main()
{
    static_cast_demo();
    const_cast_demo();
    reinterpret_cast_demo();
    dynamic_cast_demo();
    return 0;
}