Give the logical opposites of each of the following expressions; that is, give an expression that is False exactly when the given expression is True and vice versa. You may NOT use the not operator! 1. a == b 2. a <= b 3. a < 18 and day == 1 4. a >= 18 or day != 1

Write a C++ program that : You have to do the following question only by nested if-statement. FROM GRADE A TO F  A 93-100%  A- 90-92%  B+ 87-89%  B 83-86% B- 80-82%  C+ 77-79%  C 73-76%  C- 70-72%  D+ 67-69%  D 63-66%  D- 60-62%  F  Ask user to enter a grade and then determine the letter grade. Sample output:  What is your grade: 85 Your grade on your trascript would be B

2. Write a regular expression that matches the following positive cases and does not match the following negative cases. Try to make the regular expression as general as possible. positive: 0, 10, 31, 1b, OB, 12x, 2aX, 1234567890, 11111000b, 123456789abcdefX, -0, -1b, -1bx negative: 00, 010, 31b, 1c, Od, xx, OcX, a, 2b, 3B, gX, -a, --1, 1-1