fill_n() function in C++ STL with examples

The fill_n() function in C++ STL is used to fill some default values in a container. The fill_n() function is used to fill values upto first n positions from a starting position. It accepts an iterator begin and the number of positions n as arguments and fills the first n position starting from the position pointed by begin with the given value. Syntax:

void fill_n(iterator begin, int n, type value);

Parameters:

• begin: The function will start filling values from the position pointed by the iterator begin.
• n: This parameter denotes the number of positions to be filled starting from the position pointed by first parameter begin.
• value: This parameter denotes the value to be filled by the function in the container.

Return Value: This function does not returns any value. Below program illustrate the fill_n() function in C++ STL: Reference: https://cplusplus.com/reference/algorithm/fill_n/