Programa De Factorial Y Srie Fibonacci

#include<iostream>

#include<stdio.h>

int fibonacci(int n)

{

if (n<2)

return n;

else

return fibonacci(n-1) + fibonacci(n-2);

}

using namespace std;

int main()

{

int op;

do{

cout<< "***PROGRAMA FACTORIAL Y FIBONACCI***\n\n\n";

cout<< "1.-calcular el factorial de un numero\n";

cout<< "2.-serie fibonacci de un nemero\n";

cout<< "3.-Salir\n\n";

cout<< "opcion: ";cin>>op;cout<<"\n\n";

switch(op)

{

case 1:{

int num,fact=1;

system("CLS");

cout << "::FACTORIAL::" << "\n\n";

cout << "Introduce un numero: "; cin >> num;

cout << "\n";

for(int i=2; i<=num; i++)

{

fact = fact * i;

}

cout << "Su factorial es: " << fact << "\n\n";

system("pause");

system("CLS");

break;

...