Write a complete C program that calculates the promotion of employees in a company. Ask the employee to enter their age, salary, and years of service. If:

• The employee's age is less than 30 and their years of service are less than 3 years, add $200 to their salary.
• The employee's age is greater than 40 or their years of service are more than 5, add $300 to their salary.
• Otherwise, add $100 to their salary.