How to determine if a char array is empty in C language?

8 months ago

Noah Thompson

2 minutes

In C language, to determine if a char array is empty typically means checking if all elements in the array are null characters (‘\0’).

A common method is to use a loop to iterate through an array and check if each element is an empty character. If all elements in the array are empty characters, then the array can be considered empty.

Here is a sample code:

#include <stdio.h>
#include <stdbool.h>

bool isCharArrayEmpty(char arr[], int size) {
    for (int i = 0; i < size; i++) {
        if (arr[i] != '\0') {
            return false; // 如果数组中有一个元素不是空字符，则返回false
        }
    }
    return true; // 如果数组中所有元素都是空字符，则返回true
}

int main() {
    char arr1[] = {'\0', '\0', '\0'};
    char arr2[] = {'a', 'b', 'c'};

    if (isCharArrayEmpty(arr1, sizeof(arr1)/sizeof(arr1[0]))) {
        printf("arr1 is empty\n");
    } else {
        printf("arr1 is not empty\n");
    }

    if (isCharArrayEmpty(arr2, sizeof(arr2)/sizeof(arr2[0]))) {
        printf("arr2 is empty\n");
    } else {
        printf("arr2 is not empty\n");
    }

    return 0;
}

In the above code, the isCharArrayEmpty function is used to check if a char array is empty. In the main function, the isCharArrayEmpty function is called to determine if the two arrays arr1 and arr2 are empty.