What is memset in cpp or C? Where it is used in cpp programs

void* memset( void* str, int ch, size_t n);

Parameters

str[] :

 Pointer to the object to copy the character.

ch :

 The character to copy.

n :

 Number of bytes to copy.

Return value :

The memset() function returns str, the pointer to the destination string.

memset(ans, 0, sizeof ans);

Here it is basically filling up whole ans array with 0 value.

You can fill up any array wit 0 or -1 using this method, but it doesn’t work for other numeric value.

But it can copy any character whatever you want to copy.

#include <cstring> 
#include <iostream> 
 using namespace std; 
 int main() 
{ 
 char str[] = "freshlybuilt"; 
 memset(str, 'a', sizeof(str)); 
 cout << str; 
 return 0; 
}

Output:

aaaaaaaaaaaa

Reference:

https://www.geeksforgeeks.org/maximum-number-of-nodes-which-can-be-reached-from-each-node-in-a-graph/