Can I declare a variable with an uncertainty number suffix?

[shadow3d]

Hi all,

I want to declare a variable whose name is decided by a variable value.
such as: if idx=0, then I need a new variable named var_00; if idx=1, then I need a new variable named var_01; ...; if idx=255, then I need a new variable named var_FF;
I don't know if it can be realized by '#' and '##', can anyone help me?
Thanks a lot!

#include <stdio.h>
#include <stdint.h>

#define NAME(a)     p_##a

int main()
{
    uint8_t idx = 0;
    
    uint8_t* NAME(idx) = NULL;
    
    p_idx = &idx;       // not p_idx, I want p_00;
    
    printf("*p_idx = %d\n", *p_idx);
    
    return 0;
}

 

[alexcray]

Hi all,

I want to declare a variable whose name is decided by a variable value.
such as: if idx=0, then I need a new variable named var_00; if idx=1, then I need a new variable named var_01; ...; if idx=255, then I need a new variable named var_FF;
I don't know if it can be realized by '#' and '##', can anyone help me?
Thanks a lot!

#include <stdio.h>
#include <stdint.h>

#define NAME(a)     p_##a

int main()
{
    uint8_t idx = 0;
   
    uint8_t* NAME(idx) = NULL;
   
    p_idx = &idx;       // not p_idx, I want p_00;
   
    printf("*p_idx = %d\n", *p_idx);
   
    return 0;
}

Dictionaries (or Maps) are data structures that store key-value pairs. You can use the value of idx as the key and create the desired variable value as the corresponding value in the dictionary.

 

[alexcray]

Yes, you can declare a variable with an uncertainty number suffix, especially in scientific or technical contexts where uncertainty is a crucial aspect of measurement and analysis.

 

[Infinityhost]

Technically I suppose all C compilers have variable list (each type, address, and place for value) You need to create such list. In javascript would be easier. I think it's very ,very restricted place.