Question

My application reads settings from a conf file first, and then those options can be overwritten from the cli arguments. After it loads the settings from the conf, I need to check if the require values are set but I’m stuck at making it check the variables.

Sample code:

#include <stdio.h>

int main() {

const char* test;

if (test != NULL)
   std::cout << test << "\n";
else
   std::cout << "no value set\n";

return 0;
}

What did I do wrong?

Answer 1

You didn’t initialize test. If you want it to be NULL initially, you have to set it:

const char* test = NULL;