Describe those lines

Question

#include <stdio.h>    

#define get(s) #s  //***

int main()
{
    char str[] = get(hello);  //***

    printf("%s\n", str);
    return 0;
}

Help me to understand the two lines with the //*** comment? Can anyone describe what's happening in the #define?

Answer 1

This is using the preprocessor's stringification feature. You can read more about it at https://en.cppreference.com/w/c/preprocessor/replace under "# and ## operators".

The effect is that the second marked line expands to

    char str[] = "hello";