I am trying to copy one string to char array, string have multiple NULL character. My problem is when first NULL character encountered my program stops copying the string.
I have used two approaches. This is what I am so far.
#include<iostream>
#include<string.h>
using namespace std;
int main()
{
std::string str = "Hello World.\0 How are you?\0";
char resp[2000];
int i = 0;
memset(resp, 0, sizeof(resp));
/* Approach 1*/
while(i < str.length())
{
if(str.at(i) == '\0')
str.replace(str.begin(), str.begin()+i, " ");
resp[i] = str.at(i);
i++;
}
/* Approach 2*/
memcpy(resp, str.c_str(), 2000);
cout << resp << endl;
return 0;
}
This program should print Hello World. How are you?
. Please help me to correct this.
Use
std::copy
:followed by
std::replace
:You may want to define your character array so that it is full of zeros at the start:
You could also one-shot it with
Of course as @Mats has mentioned your string doesn't have any null chars, strings can also be initialized as follows though:
C++14 has a
std::string
literal operator