C++ Program to print Fibonacci series

Write and execute a C++ program to

1. display the first 25 Fibonacci numbers
2. display the Fibonacci series up to 5000.

PROGRAM

1.

#include<iostream>

using namespace std;

int main()

{

int first=0,second=1,third,i,n;

cout<<"Enter how many terms required:";

cin>>n;

cout<<"The required Fibonacci series is:\n"<<first<<"\n"<<second<<"\n";

for(i=2;i<n;i++)

{

third=first+second;

first=second;

second=third;

cout<<third<<"\n";

}

return 0;

}

OUTPUT

Enter how many terms required:25

The required Fibonacci series is:

0

1

1

2

3

5

8

13

21

34

55

89

144

233

377

610

987

1597

2584

4181

6765

10946

17711

28657

46368

2.

#include<iostream>

using namespace std;

int main()

{

int first=0,second=1,third,i,n;

cout<<"Enter number upto which series is required:";

cin>>n;

cout<<"The required Fibonacci series is:\n"<<first<<"\n"<<second<<"\n";

third=first+second;

while(third<=n)

{

cout<<third<<"\n";

first=second;

second=third;

third=first+second;

}

return 0;

}

OUTPUT

Enter number upto which series is required:5000

The required Fibonacci series is:

0

1

1

2

3

5

8

13

21

34

55

89

144

233

377

610

987

1597

2584

4181