Please write a separate code in C for each of the following questions, put these three $.$C or $.$CPP files in a folder, make it zip or rar and upload it on this link. $1)$ write a program which receives n integers from the user and prints the first and the second maximum of the entered numbers. $2)$ Write a program that repeats until the user enters negative numbers and in each repetition, it receives two integers and prints their GCD $($greatest common divizor$).3)$ write a program which gets n integers from the user and and out of the entered numbers, prints only prime numbers.