Consider the university enrollment database schema: 547 student(snurn: integer, snarne: string, majot: string, level: string, age: integer) class( name: string, meets_at: time, toom: string, fid"' integer) enrolled(snum: integer, cname: string) faculty(fid: integer, fname: string, deptid: integer) the meaning of these relations is straightforward; for example, enrolled has one record per student-class pair such that the student is enrolled in the class. for each of the following transactions, state the sql isolation level you would use and explain why you chose it.

1. enroll a student identified by her snum into the class named 'introduction to database systems'.
2. change enrollment for a student identified by her snum from one class to another class,
3. assign a new faculty member identified by his fid to the class with the least number of students.
4. for each class, show the number of students enrolled in the class.

Write a program that reads in a series of lines of input character by character (using the library function the first line of the input contains an integer which specifies the number of remaining lines of input, each of which contains a floating point number. the integer value on the first line can be read with (the library function) but all of the following lines can only be read with each line, after the first, contains a single floating point value, with up to four digits before the decimal point, and up to four digits following the decimal point, but there is not necessarily a decimal point in each number; i. e., it may appear to be an integer, but the digits should be read by your program, and the number should be converted to a corresponding floating point number. for instance, suppose the following input: 5 3.1255 20.25 0.875 1921.50 31 the required output is: − each of the input floating point values, printed on a separate line with four digits of precision, using printf(); − on the last line of the output, the string “total: ” followed by the sum of the input values, printed with printf() to 4 digits of precision. for example, the total of the sample input given above is 1976.7505, so the required output for this input would be: 3.1255 20.2500 0.8750 1921.5000 31.0000 total: 1976.7505 do not concern yourself with small differences in the total due to rounding, as the grader will not deduct points for this. constraints: − you are not allowed to use arrays on this portion of the lab assignment. − there is no maximum number of lines allowable. it all depends upon the first value of input. since you aren’t saving anything, it doesn’t matter. − you can assume that input will not contain more than 4 digits before or after the decimal point. you do not need to error check for this condition. -you must use getchar() to read in the floating point values one character at a time (i. e. do not use -you must declare and use your floating point values as a double to minimize rounding errors. -only use printf() to output the floating point numbers and the total (do not use − be sure your directions to the user are clear so they are sure to enter the input data correctly.