How to calculate array length in c++

Method to calculate array length in C: sizeof() operator: size_t length = sizeof(array) / sizeof(array[0]);.size() method (applicable to vector): size_t length = my_vector.size();

C How to calculate the array length

Method to calculate the array length

The length of the array in C can be calculated by the following method:

• Use the sizeof() operator:

<code class="cpp">size_t length = sizeof(array) / sizeof(array[0]);</code>

• Using .size() method (for vector):

<code class="cpp">size_t length = my_vector.size();</code>

Example

<code class="cpp">// 声明一个包含 10 个整数的数组
int my_array[10];

// 计算数组长度
size_t length = sizeof(my_array) / sizeof(int);

// 输出数组长度
cout << "数组长度：" << length << endl;</code>

Output:

<code>数组长度：10</code>

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