常量指针与指针常量

#include <stdio.h>
int main() {
    char c = '\0';
    if (c)
        printf("afa");
    int x = 1, y = 10;
    const int *p2 = &x;
    printf("%d\n", *p2);
    x = 2;
    //*p2 = 3; //常量指针，指向常量的指针，*p2是一个常量，不能修改
    printf("%d\n", *p2);
    int *const p3 = &x;
    // p3 = &y;  //指针常量
    return 0;
}