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Answer to Question #45007 in C++ for nilesh

Question #45007
1.write a proram to find the sum of series
a)S=1+x+x^2+x^3......................+x^n
b)1^2+2^2+3^2..............+n^2
c)2/9-5/13+8/17..................
2.to print fibonacci series.

Expert's answer
#include <stdlib.h>
#include <iostream>  // for cout and cin
#include <stdio.h>
#include <cstdlib>   // for system
using namespace std;
long  Power(long  x, long  _power)
{
long _x = x;
if (_power == 0) return 1;
for (long  i = 0; i < _power -1;i++) 
x *= _x;
return x;

}
int main()
{
long Sum1 = 0; long Sum2 = 0;
double value = 0;
double Sum3 = 0;
long x = 0; long n = 0;
cout<<"enter n"<<endl;
cin>>n;
cout<<"enter x"<<endl;
cin>>x;
for (long i = 0; i < n + 1; i++)
{
 Sum1 += Power( x, i);
 Sum2 += Power( i, 2);
 if (i < n)
 {
 value = (2 + i*3)/ double(9 + i*4);
 if (i % 2 != 0) value *= -1;
 Sum3 += value;
 }
}
cout<<"Sum1 = "<<Sum1<<endl;
cout<<"Sum2 = "<<Sum2<<endl;
cout<<"Sum3 = "<<Sum3<<endl;
system("pause");
return 0;
}
 
 
 
 

#include <stdlib.h>
#include <iostream>  // for cout and cin
#include <stdio.h>
#include <cstdlib>   // for system
using namespace std;
long Fibon(long i)
{
 if(i==0) return 1;
 if(i==1) return 1;
 if(i<0) return 0;
 return Fibon(i-2) + Fibon(i-1);
}
int main()
{
  long value,n;
 
  cout<<"How many Fibonacci numbers do you want to display?"<< endl;
  cin>>n;
  cout<<endl;
  cout<<"Fibonacci numbers : ";
  for (int i = 0; i < n ; i++)
  {
 value = Fibon(i);
      cout<<value<<" ";
  }
  cout<<endl;
  system("pause");
  return 0;
}



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