Write a C-code for a program that reads the age of 25 patients. The program should read two numbers for every patient:

The first number indicates the test result: if the patient is positive_COVID-19 then enter 1 and if negative_COVID-19 enter -1.

The second number: the patient's age.

Your program should then calculate and print the following:

1. The average age of all patients.

2. Number of negative COVID-19 patients.

3. Find the test result (positive or negative) for the oldest patient.