memset(used,0,sizeof(used));什么意思
时间: 2024-05-22 18:11:29 浏览: 6
这行代码使用 C/C++ 语言中的标准库函数 `memset()`,用于将一段内存空间的内容全部设置为指定的值。具体来说,`memset(used, 0, sizeof(used))` 的含义是将数组 `used` 中的所有元素都设置为 0。
其中,`used` 是一个数组名称,`0` 是要设置的值,`sizeof(used)` 是数组 `used` 所占用的内存空间的大小,即数组长度乘以每个元素所占用的字节数。这样可以确保将整个数组的内容都设置为指定的值。
相关问题
memset(dp,0,sizeof(dp));
This line of code initializes a dynamic programming array called "dp" with zeros. The "memset" function is used to set a block of memory to a particular value. In this case, it sets the block of memory associated with the "dp" array to zero. The "sizeof" operator is used to determine the size of the "dp" array in bytes, which is passed as the third parameter to the "memset" function.
memset(&m_oldPos,0,sizeof(TvMatch))代码语句含义
)memset() is a C++ function used to initialize a block of memory with a particular value. It fills a block of memory with the given value by changing every byte of memory to that value. The function takes three arguments: a pointer to the memory block to be filled, the value to be set into each byte, and the number of bytes to be filled.
For example, consider the following code:
```
int arr[10];
memset(arr, 0, sizeof(arr));
```
This code sets each element in the `arr` array to zero by filling it with the value `0`. The function `sizeof()` is used to calculate the number of bytes required to hold the array.
In general, `memset()` is used to quickly set large arrays or blocks of memory to a specific value, such as initializing an array of integers to zero, or quickly clearing out a buffer before writing new data to it.