Program 1: Name the first program AP4-1.cpp and submit. Use your AP3-2.cpp program and modify to validate all user input.   Hint: Use a do...while; loop to validate user input for what type of...

Use your AP3-2.cpp program and modify to validate all user input.Hint: Use a do...while; loop to validate user input for what type of beam.  Another hint: For an I-beam, h must be less than H. (Program AP3-2.cpp is below)