help in sas..

Given the following as program: answer the following questions: What does the input buffer look like during the first iteration of the DATA step? What does the program data vector look like at the beginning of the first iteration of the DATA step? What does the program data vector look like at the end of the first iteration of the DATA step? What does the grades data set look like at the end of the first iteration of the DATA step? What does the input buffer look like during the second iteration of the DATA step? What does the program data vector look like at the beginning of the second iteration of the DATA step? What does the program data vector look like at the end of the second iteration of the DATA step? What is the largest value the automatic variable _N_ takes on in the process of executing this program? What does the grades data set look like after this DATA step is fully executed? Would you expect any errors, warnings, or notes to be displayed in the log window upon executing this program? If so, describe them briefly. Given the following as program: answer the following questions: What does the input buffer look like during the first iteration of the DATA step? What does the program data vector look like at the beginning of the first iteration of the DATA step? What does the program data vector look like at the end of the first iteration of the DATA step? What does the grades data set look like at the end of the first iteration of the DATA step? What does the input buffer look like during the second iteration of the DATA step? What does the program data vector look like at the beginning of the second iteration of the DATA step? What does the program data vector look like at the end of the second iteration of the DATA step? What is the largest value the automatic variable _N_ takes on in the process of executing this program? What does the grades data set look like after this DATA step is fully executed? Would you expect any errors, warnings, or notes to be displayed in the log window upon executing this program? If so, describe them briefly