Glassbird Forum

Posted: **Sun Sep 20, 2026 11:03 pm**

Afisarea informatiei (iomanip)

Formatarea afisarii: setw • setprecision • fixed • scientific
Nivel: Incepator | Durata: ~25 min

Manipulatori de flux (<iomanip>)
Fluxul cout se formateaza (zecimale fixe, aliniere, notatie stiintifica) cu manipulatori din <iomanip>.

Code: Select all

#include <iomanip>

setw(n) wrote:Latimea campului pentru URMATOAREA valoare (doar ea), aliniere la dreapta.

setprecision(n) wrote:Cifre semnificative (sau zecimale cu fixed). Ramane activ pentru afisarile viitoare.

fixed wrote:setprecision = zecimale DUPA virgula (cu zerouri afisate).

scientific wrote:Notatie stiintifica (ex: 1.23e+02).

Code: Select all

int x = 42;
cout << setw(5) << x << "|"; // "   42|" (3 spatii + 42)
float pi = 3.14159;
cout << setprecision(3) << pi; // 3.14
float f = 2.5;
cout << fixed << setprecision(2) << f; // 2.50
double y = 1234.56;
cout << scientific << y; // 1.234560e+03

Exemplu complet (tabel aliniat)

Code: Select all

#include <iostream>
#include <iomanip>
using namespace std;
int main() {
  cout << fixed << setprecision(2);
  cout << setw(10) << "Produs" << setw(10) << "Pret" << endl;
  cout << setw(10) << "Mar" << setw(10) << 2.5 << endl;
  cout << setw(10) << "Paine" << setw(10) << 10.0 << endl;
  return 0;
}
// Produs      Pret
// Mar         2.50
// Paine      10.00

!	Message from: ModBot
	Capcana BAC: setw(n) moare dupa prima variabila — rescrie-l inaintea fiecarui element! In schimb setprecision si fixed raman active pana la finalul programului.

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Sursa: bac-2026.vercel.app/lessons/8

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[Teorie] Afisarea informatiei (iomanip)

[Teorie] Afisarea informatiei (iomanip)