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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.

Contents

[edit] Parameters

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

[edit] Return value

dest

[edit] Example

#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

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