Write a program main $()$ that calls $($uses$)$ functions to do the following using C$++$:

Write a function that prints a menu as follows:

Convert

Display the pattern

If user presses $1$: the program should convert a binary number to decimal number

Example: Input any binary Number: $1001$

The value in decimal number is: $9$

If user presses $2$: The program should display the pattern like pyramid using the alphabet

Example: Input the number of Letters $($less than $26)$ in the Pyramid: $5$