How can I copy multiple char* strings into one using strcpy_s()?

Question

Using the strcpy_s() function I want to collate the first three strings into the final one to print my full name. This is what I have and it doesn't work as I'm using char* strings and not std::strings.

#include <iostream>
using namespace std;

int main()
{
    char str_first[] = "Nerf_";
    char str_middle[] = " Herder";
    char str_last[] = "42";

    char str_fullName[35];

    strcpy_s(str_fullName, (str_first + str_middle + str_last).c_str());
    cout << str_fullName;
}

Any suggestions?

Answer 1

You need to use both strcat and strcpy

See code comments for more info.

// disable SDL warnings in Visual studio
#define _CRT_SECURE_NO_WARNINGS

#include <cstring>
#include <iostream>
using namespace std;

int main()
{
    // TODO: insert checking code,
    // to make sure destination can hold all characters + one termination.

    char str_first[] = "Nerf_";
    char str_middle[] = " Herder";
    char str_last[] = "42";

    char str_fullName[35];

    // copy first string because we need null terminated destination
    strcpy(str_fullName, str_first);

    // append the rest, string is auto null terminated.
    strcat(str_fullName, str_middle);
    strcat(str_fullName, str_last);

    cout << str_fullName;
}