How can we use strlen in C language to calculate the length of an array?

9 months ago

Liam

2 minutes

When using the strlen function to calculate the length of an array, it is important to pass the array as a parameter to the function. However, it is crucial to note that the strlen function is used to calculate the length of a string, which is the length of a character array, and not the length of a general array.

To calculate the length of a regular array, you can achieve it by the following method:

#include <stdio.h>

int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int len = sizeof(arr) / sizeof(arr[0]);
    
    printf("数组的长度为：%d\n", len);
    
    return 0;
}

In the example above, by using the sizeof operator, you can obtain the total number of bytes occupied by an array, then by dividing it by the number of bytes per element, you can get the length of the array.