C++ Programs
C++ programs are frequently asked in the interview. These programs can be asked from basics, array, string, pointer, linked list, file handling etc. Let's see the list of top c++ programs.
1) Fibonacci Series
Write a c++ program to print fibonacci series without using recursion and using recursion
Input: 10
Output: 0 1 1 2 3 5 8 13 21 34
Fibonacci Series in C: In case of fibonacci series, next number is the sum of previous two numbers for example 0, 1, 1, 2, 3, 5, 8, 13, 21 etc. The first two numbers of fibonacci series are 0 and 1.
There are two ways to write the fibonacci series program:
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Fibonacci Series without recursion
-
Fibonacci Series using recursion
Fibonacci Series in C++ without recursion
Let's see the fibonacci series program in c++ without recursion.
#include <iostream>
using namespace std;
int main() {
int n1=0,n2=1,n3,i,number;
cout<<"Enter the number of elements: ";
cin>>number;
cout<<n1<<" "<<n2<<" "; //printing 0 and 1
for(i=2;i<number;++i) //loop starts from 2 because 0 and 1 are already printed
{
n3=n1+n2;
cout<<n3<<" ";
n1=n2;
n2=n3;
}
return 0;
}
Fibonacci Series using recursion in C++
Let's see the fibonacci series program in c++ using recursion.
#include<iostream>
using namespace std;
void printFibonacci(int n){
static int n1=0, n2=1, n3;
if(n>0){
n3 = n1 + n2;
n1 = n2;
n2 = n3;
cout<<n3<<" ";
printFibonacci(n-1);
}
}
int main(){
int n;
cout<<"Enter the number of elements: ";
cin>>n;
cout<<"Fibonacci Series: ";
cout<<"0 "<<"1 ";
printFibonacci(n-2); //n-2 because 2 numbers are already printed
return 0;
}