c语言，sizeof关键字，数组和指针区别

#include <stdio.h>
#include <stdlib.h>

int main()
{
    char c = ' ';   //1 byte
    int a = 0;      //4 bytes
    long l = 100;   //4 bytes
    float f = 1.0;  //4 bytes
    int array[10];
    int *array_p = array;
    char *c_p = "abcdef";
    char c_array[] = "abcdef";
    printf("%d\n", sizeof(array_p));    //pointer size, 4 bytes
    printf("%d\n", sizeof(array));      //array size, 40 bytes
    printf("%d\n", sizeof(c_p));        //pointer size, 4 bytes
    printf("%d\n", sizeof(c_array));    //char array size, including the final char '\0', 7 bytes, different from function strlen, which ignoring the ending char '\0'
    return 0;
}
//从这里也可以看出数组和指针并非完全的等价
//注意sizeof不是函数，属于关键字