Fibonacci number. In mathematics, the Fibonacci numbers area sequence of numbers

Question

Fibonacci number. In mathematics, the Fibonacci numbers area sequence
of numbers named after Leonardo of Pisa, known as Fibonacci. Thefirst number of the
sequence is 0, the second number is 1, and each subsequent numberis equal to the sum of
the previous two numbers of the sequence itself, yielding thesequence 0, 1, 1, 2, 3, 5, 8,
etc. In mathematical terms, it is defined by the followingrecurrence relation:




In Function 2, let’s call this function fib(int n). The inputto the function is variable n,
and the function returns an integer. For examples, given n as 0,fib(0) returns 0; and
given n as 4, fib(4) returns 3.
In main( ) function, you need to do the following:

5. produce a sequence of 20 Fibonacci numbers and output thesenumbers on screen
and write these numbers into “.txt”
In step 2, main ( ) function needs to call function 1 (gcd).In step 5, main( )
function needs to call function 2 (fib).

Example of" txt" should look like this, if eight numbers in Fibsequence,
0 1 1 2 3 5 8 13 21
Notice that your program is to produce 20 Fib numbers.

Explanation / Answer

please rate - thanks I don't understand this      In step 2,main ( ) function needs to call function 1 (gcd). In step 5, main() function needs to call function 2 (fib). #include #include int fib(int); int main() { int first,second,next,i,fibn;     int n=20;     ofstream output;     output.open("fib.txt");     for(i=0;i

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