2. lekce – C / C++ – Fórum – Programujte.com

Tak sem zkousel si vytvorit nekolik vlastnich programku podle 2.lekce (uz sem pokrocil :D ) a zas mam drobny problem:
Tohle mi jede:

// Integer_and_real_division



#include <iostream>

using namespace std;

long main ()

{

	int A = 18, B = 7;

	cout << "Integer: " << A << ", " << B << endl ;

	cout << "Integer division: " << A / B << endl ;

	cout << "Remain: " << A % B << endl << endl ;

	cin.get();

	return 0;

}

// Integer_and_real_division



#include <iostream>

using namespace std;

long main ()

{

	int A = 18, B = 7;

	cout << "Integer: " << A << ", " << B << endl ;

	cout << "Integer division: " << A / B << endl ;

	cout << "Remain: " << A % B << endl << endl ;

	cin.get();

	double (A);

	double (B);

	cout << "Real: " << A << ", " << B << endl ;

	cout << "Real division: " << A / B << endl ;

	cin.get();

	return 0;

}

Mno chyba je v nespravne umistenem pretypovani..

// Integer_and_real_division



#include <iostream>

using namespace std;

long main ()

{

     int A = 18, B = 7;

     cout << "Integer: " << A << ", " << B << endl ;

     cout << "Integer division: " << A / B << endl ;

     cout << "Remain: " << A % B << endl << endl ;

     cin.get();

     cout << "Real: " << A << ", " << B << endl ;

     cout << "Real division: " << A / double(B) << endl ;

     cin.get();

     return 0;

}

To nickJartin:

Hm, uz to funguje, dik, ale vysledek se mi porad zaokrouhli na 5 desetinnych mist (2,57143) ..
At uz pouziju double / long double, ktere by mely zaokrouhlovat na 15 (19) mist..

no ja do C++ nedelam, ale domnivam se ze to zaokrouhleni na 5mist je default, takze je potrebato zmenit:
treba:

//vydelit

cout.precision(6);

// vypsat na 6 pozic

cout.precision(5);// return to default

nie precision ale setprecision (hlavickovy subor iomanip treba pripojit)

priklad pouzitia - zaokruhlenie na 15 cifier

#include <iostream>

#include <iomanip>

using namespace std;



int main()

{

  double cislo = 5.1246548748654564456542341874564158;

  cout << setprecision(16) << cislo;

  

  system("PAUSE");

  return 0;

}

jj ja si to taky pamatoval jako setprecision, ale radeji sem se podival do google na prvni odkaz:

http://www.tacc.utexas.edu/services/userguides/pgi/pgC++_lib/stdlibcr/cou_4514.htm

aha pardon mas pravdu:

su 2 druhy zapisu:

a) cout << setprecision(10);
b) cout.precision(10)

su to ekvivalenty ;-)