C program to get variable name as input and print value

Question

I have a program test.c

int global_var=10;
printf(\"Done\");

i did

gcc -g test.c -o test

My query is I

Answer 1

No, C doesn't have introspection. Once the compiler has generated code, the program can not look up variable names.

The way these things are usually solved is by having a collection of all special variables that needs to be looked up by name, containing both the actual name as a string and the variable it self.

Usually it's an array of structures, something like

struct
{
    const char *name;
    int value;
} variables[] = {
    { "global_var", 10 }
};

The program can then look through the array variables to search for "global_var" and use (or change) the value in the structure.