int len = sizeof(array) / sizeof(int);
时间: 2023-11-20 17:05:29 浏览: 122
这行代码用于计算数组array的长度。在C语言中,可以使用`sizeof`操作符来计算数组或变量在内存中占用的字节数。`sizeof(array)`表示整个数组array所占用的字节数,而`sizeof(int)`表示int类型的字节数。
因为数组array中每个元素的类型都是int,所以将整个数组的字节数除以int类型的字节数,就可以得到数组的长度。
这样计算数组长度的好处是,可以避免手动指定数组长度,提高代码的可维护性和灵活性。无论数组的大小如何改变,都可以正确计算出数组的长度。
相关问题
int len=sizeof(a)/sizeof(a[0]);
This line of code calculates the length of an array "a" by dividing the total size of the array by the size of its first element.
The "sizeof" operator in C++ returns the size in bytes of a variable or data type. In this case, it is used to get the total size of the array "a" in bytes.
The "/ sizeof(a[0])" part of the line of code divides the total size of the array by the size of its first element, which gives the number of elements in the array.
The variable "len" is then assigned the value of the number of elements in the array, which can be used in subsequent code to loop through the array or perform other operations.
len = sizeof(arr) / sizeof(arr[0]);
这段代码的作用是计算一个数组中元素的个数。其中,`sizeof(arr)`表示整个数组所占的字节数,`sizeof(arr)`表示数组中单个元素所占的字节数。因此,`sizeof(arr) / sizeof(arr)`的结果就是数组中元素的个数。将其赋值给变量`len`,就可以得到数组中元素的个数。下面是一个例子:
```c++
#include <iostream>
using namespace std;
int main() {
int arr[] = {1, 2, 3, 4, 5};
int len = sizeof(arr) / sizeof(arr[0]);
cout << "The length of the array is: " << len << endl;
return 0;
}
```
输出结果为:
```
The length of the array is: 5
```
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