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# Sum of squares of Fibonacci numbers in C++

Fibonacci series is a mathematical sequence of number which starts from 0 and the sum of two numbers is equal to the next upcoming number, for example, the first number is 0 and the second number is 1 sum of 0 and 1 will be 1

F0=0, F1=1

And

Fn=Fn-1+Fn-2, F2=F0+F1 F2=0+1 F2=1

then when we add number 1 and 1 then the next number will be 2

F1=1, F2=1

And

Fn=Fn-1+Fn-2, F3=F1+F2 F3=1+1 F3=2

Fibonacci sequence is 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, …

We have to find the square of the fuel energy series and then we have to sum it and find the result

Input :4 Output:15 Explanation:0+1+1+4+9=15 forest we will solve Fibonacci numbers till N then we will square them then at them

## Example

#include <iostream> using namespace std; int main(){ int n=4, c; int first = 0, second = 1, next; int sum =0; for ( c = 0 ; c < n+1 ; c++ ){ if ( c <= 1 ) next = c; else{ next = first + second; first = second; second = next; } sum+=next*next; } printf("%d",sum ); return 0; }

## Output

15

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