Write a program that:

prompts the user to enter his name.

welcomes the user to the program.

prompts the user to enter four floating$-$point numbers.

prints the largest and the smallest of the four inputs without using the max or min function.

prints the sum of the numbers.

prints the average of the numbers.

For example:

Enter your name: Maryam Jose

Welcome, to my program Maryam Jose!

Enter a number: $4$

Enter a number: $9$

Enter a number: $2\mathrm{.}5$

Enter a number: $12\mathrm{.}5$

The largest number is $12\mathrm{.}5$

The smallest number is $2\mathrm{.}5$

The sum is $28\mathrm{.}0$

The average is $7\mathrm{.}0$