1. Create a program that displays the average of three integers. The program should pass the three integers to a program-defined function named calcAvg, which should return the result as a double number. Name the formal parameters n1, n2, and n3. Use the following names for the actual arguments: num1, num2, and num3. Assign the functions return value to a double variable named avg. Display the average in fixed-point notation with one decimal place.