Create a structure named date that has day, month and year as its members. Include this structure as a member in another structure named employee which has name, id and salary as other members. Use this structure to read and display employee's name, id$,$ date of birthday and salary.

Define a structure of employee having data members name, address, age and salary. Take the data for $n$ employees in an array and find the average salary.

Write a program to read the name, address, and salary of $5$ employees using array of structure. Display information of each employee in alphabetical order of their name.