C错误:赋值给具有数组类型的表达式

#include <stdio.h>

int main() {
    int arr[5];

    for (int i = 0; i < 5; i++) {
        arr[i] = 42;
    }

    for (int i = 0; i < 5; i++) {
        printf("%d ", arr[i]);
    }

    return 0;
}

#include <stdio.h>

int main() {
    int arr1[5] = {1, 2, 3, 4, 5};
    int arr2[5];

    for (int i = 0; i < 5; i++) {
        arr2[i] = arr1[i];
    }

    for (int i = 0; i < 5; i++) {
        printf("%d ", arr2[i]);
    }

    return 0;
}