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# std::memset

From cppreference.com
< cpp‎ | string‎ | byte

Defined in header `<cstring>` |  |
void* memset( void* dest, int ch, std::size_t count ); |  |

Converts the value `ch` to unsigned char and copies it into each of the first `count` characters of the object pointed to by `dest`. If the object is not trivially-copyable (e.g., scalar, array, or a C-compatible struct), the behavior is undefined. If `count` is greater than the size of the object pointed to by `dest`, the behavior is undefined.

### [edit] Parameters

dest | - | pointer to the object to fill
ch | - | fill byte
count | - | number of bytes to fill

### [edit] Return value

`dest`

### [edit] Example

Run this code

    #include <iostream>
    #include <cstring>

    int main()
    {
        int a[20];
        std::memset(a, 0, sizeof(a));
        for (int ai : a) std::cout << ai;
    }

Output:

    00000000000000000000

### [edit] See also

memcpy | copies one buffer to another (function) [edit]
fill_n | assigns a value to a number of elements (function template) [edit]
is_trivially_copyable (C++11) | checks if a type is trivially copyable (class template) [edit]
C documentation for memset

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