Please explain in C++. THANK YOU!

1. Fibonacci Sequence. The Fibonacci Sequence is the series of numbers: 0, 1, 1, 2, 3, 5, 8,13, 21, 34, The next number is found by adding up the two numbers before it. Function prototype: int fibon(int seqNumber); The command line arguments would be: fib seqNumber 2. Factoral: 3.-3*2*1:10. = 10.9.8*7*6*5*4*3*2*1 etc Function prototype: double factoral(int argument); I/Why use double here? . combine the command line arguments into a single string with spaces between each argument starting with argv[2]; Use only the minimum amount of memory to store the combined string. You may not use or functions Function prototype: char . mergeCLA(int argc, charargv[]); Merging will start with argv[2] string