How do you initialise a dynamic array in C++?

Question

How do I achieve the dynamic equivalent of this static array initialisation:

char c[2] = {};  // Sets all members to '\0';

In other words, create a dynamic array with all values initialised to the termination character:

char* c = new char[length]; // how do i amend this? 

Answer 1

char* c = new char[length](); 

Answer 2

Two ways:

char *c = new char[length]; std::fill(c, c + length, INITIAL_VALUE); // just this once, since it's char, you could use memset 

Or:

std::vector<char> c(length, INITIAL_VALUE); 

In my second way, the default second parameter is 0 already, so in your case it's unnecessary:

std::vector<char> c(length); 

[Edit: go vote for Fred's answer, char* c = new char[length]();]

Answer 3

Maybe use std::fill_n()?

char* c = new char[length];
std::fill_n(c,length,0);