Write a C++ program to input student name and marks of three subjects ,and calculate average, and print grade according to the following conditions: Grade A If average >= 90 Grade B If average >= 80 Grade C If average >= 70 Grade D If average >= 60 Grade E If average >= 50 Grade F If average < 50

Write a C++ program to input student name and marks of three subjects ,and calculate average, and print grade according to the following conditions: