Generador de LookUp Table de señales senoidales

#include <iostream>
#include <string>
#include <sstream>
#include <cstdint>
#include <cmath>
#include <iomanip>

#define _exit_with_error(X) {cout << (X) << endl; exit(1);}

using namespace std;

int main(int argc, char *argv[]) {

    const uint8_t bytes[] = {8,16,32,64};

    if(argc != 3) {
        cout << "usage:\n\t " << *argv << " <bits> <steps>" << endl;
    } else {
        int ib, bits, entries;
        
        /****************************** Validaciones **********************************/        if(!(stringstream(argv[1]) >> bits) or bits <= 0 or bits > 64) 
            _exit_with_error("<bits> must be greater than 0 and less or equal than 64.");
        
        for(ib=0; ib < 4 and bits > bytes[ib]; ib++);

        if(ib == 4) 
            _exit_with_error("<bits> must be greater than 0 and less or equal than 64.");
        
        if(!(stringstream(argv[2]) >> entries) or entries <= 0)
            _exit_with_error("<entries> must be greater than 0.");
        /******************************************************************************/        
        /************************* Generación de la tabla *****************************/        // se calculan los pasos para 1 periodo
        const double step = (2.0*M_PI)/(double)entries; 
        
        // Se imprime el tipo de dato stdint
        cout << "uint" << (uint32_t)bytes[ib] << "_t sineLUT[] = {";
        cout << internal << setfill('0'); // formateo de la salida para rellenar con 0
        
        double value;
        const double maxValue = pow(2,bits)-1;
        // Se calculan los valores de la tabla:
        for(uint16_t i=0; i < entries; i++) {
            // cada 8 entradas 1 salto de linea:
            if(!(i%8)) cout << "\n    "; 
            // Se calcula el valor:
            value = ((sin(i*step)+1.0)/2.0)*(maxValue);
            // Se imprime el valor:
            cout << "0x" << hex << uppercase << setw(((bits-1)/4)+1) << (uint64_t)(value+0.5) << ",";
        }
        // Se borra la última coma y se termina la tabla:
        cout << "\b \n};" << endl;
        /******************************************************************************/    } 
}