// Name : cpp_calcolo_potenza_n.cpp // Author : Abejan // Version : 10/03/2011 // Description : Calcolo della potenza intera di un numero reale in C++, Ansi-style #include <iostream> using namespace std; double x, potenza; int n, esponente; //esponente n ed esponente assoluto //metodo che calcola x elevata a esponente void CalcolaPotenzaPositiva() { potenza=1; for(int numeroVolte=1;numeroVolte <= esponente;numeroVolte++){ potenza *= x; // potenza = potenza * x } } //metodo che calcola x elevata a n void CalcolaPotenza() { if(n>=0) esponente =n; else esponente = -n; CalcolaPotenzaPositiva(); //chiamata metodo //se n è negativo calcola il reciproco if (n < 0) potenza = 1/potenza; } //metodo che stampa il risultato void ComunicaRisultato() { cout << "Il valore della potenza è: " << potenza <<endl; } //funzione principale del programma - entry point int main() { char op; //carattere di separazione tra x e n cout << "Scrivi la potenza da calcolare nel formato x^n: "; cin >> x >> op >> n; CalcolaPotenza(); ComunicaRisultato(); return 0; }
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