What does [:] mean in C language?

The [:] symbol in C language has two uses: accessing the range of array elements, starting from a specific index and ending at a specific index. Copies a range of array elements on both sides of the assignment operator.

The meaning of the [:] symbol in C language

In C language, the [:] symbol represents array elements range. It has two main uses:

1. Access the array element range

[:] symbol can be used within square brackets [] to indicate starting from a specific index to Range of array elements ending at a specific index. For example:

<code class="c">int arr[] = {1, 2, 3, 4, 5};
int sum = 0;

for (int i = 0; i < 5; i++) {
    sum += arr[i];
}</code>

In this example, loop through the array arr and sum all elements from index 0 (first item) to index 4 (last item).

2. Copy the range of array elements

[:] symbols can also be used on both sides of the assignment operator (=) to copy the range of array elements. For example:

<code class="c">int arr1[] = {1, 2, 3};
int arr2[3];

arr2[:] = arr1; // 将 arr1 的所有元素复制到 arr2</code>

In this example, arr2[:] ​​represents all elements of arr2, and arr1 represents all elements of arr1. This statement copies all elements of arr1 into arr2.

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