如何获取char数组长度，使valgrind满意

#include <stdio.h>
#include <string.h>

int main() {
    char arr[] = "Hello World";
    int length = strlen(arr);
    printf("Length of the array: %d\n", length);
    return 0;
}

#include <stdio.h>

int main() {
    char arr[] = "Hello World";
    int length = sizeof(arr) / sizeof(arr[0]) - 1; // 减1是为了排除null字符
    printf("Length of the array: %d\n", length);
    return 0;
}

#include <stdio.h>

int main() {
    char arr[] = {'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd'};
    int length = 0;
    while (arr[length] != '\0') {
        length++;
    }
    printf("Length of the array: %d\n", length);
    return 0;
}