Question

I have several variables of type char (array), int, and double. Is there a way to identify what type they are during run-time?

For example, I’m looking for something like:

int dummyInt = 5;    
double dummyDouble = 5.0;    
dummyInt == int ?
        printf("yes, it's of int type\n") : printf("no, it's not of int type\n");
dummyDouble == int ?
        printf("yes, it's of int type\n") : printf("no, it's not of int type\n");

Where the obvious results will be:

yes, it’s of int type
no, it’s not of int type

Well, the reason why I need it is because I’m transferring data from variables into an SQL database (using SQLite). Now, the headers can change each time I run the program depending on which variables are being used. So when I’m creating the table, I need to tell it if it’s VARCHAR, INTEGER, DOUBLE etc.

Answer 1

No, you can’t, but why do you even want to do this? C is statically typed, so when you declare int dummyInt = 5, you already know that it’s an int.

Edit:

Now, the headers can change each time I run the program depending on which variables are being used. So when I’m creating the table, I need to tell it if it’s VARCHAR, INTEGER, DOUBLE etc.

That still doesn’t change much. The types are still known at compile-time, so maybe all you need is a #define alongside the actual variable that defines the SQL type, say:

int someVar;
#define SOMEVAR_SQL_TYPE "INTEGER"