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> Unfortunately, I have NO CLUE how you work with packed fields in C

I think you do this:

#include <stdio.h>                
#include <math.h>                 
#include <decimal.h>              
                                  
                                  
int main(int argc, char **argv) { 
                                  
    double z;                     
    decimal(30,0) x;              
                                  
    z = pow(16, 15);              
    printf("%.0f\n", z);          
                                  
    x = z;                        
    return 0;   
}

and x = 1152921504606846980.                  

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