# 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.

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;

}

#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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