Breaking
Coding Interview

# coding interview questions part 1

## Fibonacci Number

Fibonacci number is a number that start with one or zero and next number is equal to the sum of previous two numbers. Ex F (0) = 0, 1, 1, 2, 3, 5, 8, 13, 21, 34..
The first two numbers in the Fibonacci sequence are either 1 and 1, or 0 and 1, depending on the chosen starting point of the sequence, and each subsequent number is the sum of the previous two.,
Example:-
0, 1, 1, 2, 3, 5, 8, 13, 21, 34,

## Source Code

```package com.dsacode.Probelms;

public class Fibonacci {

public static int recursiveFibonacci(int num){
if(num==1 || num==2)
return 1;
else
return recursiveFibonacci(num-1) + recursiveFibonacci(num-2);

}

public static int iterFibonacci(int number){
if(number == 1 || number == 2){
return 1;
}

int fibo1=1, fibo2=1, fibonacci=1;

for(int i= 3; i<= number; i++){
fibonacci = fibo1 + fibo2;
fibo1 = fibo2;
fibo2 = fibonacci;

}
return fibonacci;
}

public static void main(String[] args) {

int numberOfFib =10;

System.out.print("Print the first " + numberOfFib + " Fibonacci numbers using iterative funcation:");
for(int i = 1; i <= numberOfFib; i++){
System.out.print(iterFibonacci(i) +" ");
}

System.out.print(" \nPrint the first " + numberOfFib + " Fibonacci numbers using recursive funcation:");

for(int i = 1;i <= numberOfFib; i++){
System.out.print(recursiveFibonacci(i) +" ");
}

}

}```
```#include "stdafx.h"

#include < iostream >
using namespace std;

int recursiveFibonacci(int num){
if (num == 1 || num == 2)
return 1;
else
return recursiveFibonacci(num - 1) + recursiveFibonacci(num - 2);

}

int iterFibonacci(int number){
if (number == 1 || number == 2){
return 1;
}

int fibo1 = 1, fibo2 = 1, fibonacci = 1;

for (int i = 3; i <= number; i++){
fibonacci = fibo1 + fibo2;
fibo1 = fibo2;
fibo2 = fibonacci;

}
return fibonacci;
}

int _tmain(int argc, _TCHAR* argv[])
{
int numberOfFib = 10;

cout << "Print the first " << numberOfFib << " Fibonacci numbers using iterative funcation:";
for (int i = 1; i <= numberOfFib; i++){
cout << iterFibonacci(i) << " ";
}

cout << " \nPrint the first " << numberOfFib << " Fibonacci numbers using recursive funcation:";

for (int i = 1; i <= numberOfFib; i++){
cout << recursiveFibonacci(i) << " ";
}

return 0;
}

```

## Output

```Print the first 10 Fibonacci numbers using iterative funcation:1 1 2 3 5 8 13 21 34 55
Print the first 10 Fibonacci numbers using recursive funcation:1 1 2 3 5 8 13 21 34 55```

### Algorithm Explanation

1 2 3 4 5

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