C 中 Sizeof 的行为

C语言中sizeof运算符的行为

c
#include 
int main() {
    printf("Size of int: %lu bytes%
", sizeof(int));
    return 0;
}

c
#include 
int main() {
    int arr[5];
    printf("Size of array: %lu bytes%
", sizeof(arr));
    return 0;
}

c
#include 
struct Example {
    int x;
    char y;
};
int main() {
    printf("Size of struct Example: %lu bytes%
", sizeof(struct Example));
    int *ptr;
    printf("Size of int pointer: %lu bytes%
", sizeof(ptr));
    return 0;
}

c
int *dynamicArr = (int*)malloc(5 * sizeof(int));