C # Selection Statement Exercise 2

1. Input a,b,c three number, calculate the root of the ax²+bx+c of the two-order equation; if a=0, it is not a two-time equation; =b²-4ac, the formula for the root is-b±√b²-4ac/2a; if =b²-4ac>0, the equation has two different roots, if = B²-4ac=0, the equation has two identical roots, and if =b²-4ac<0, the equation has no root.

2. Enter the year, if divisible by 4 and not divisible by 100 into leap years; (Year range is 0-9999)

3. Enter the year, month, day, the month of 31 days, or the month of 30 days, a leap year or an ordinary one.

4. In hamburger, French fries, chicken nuggets, chicken legs, chicken rice Flower Select an item and then print it out, you need to use the branch statement switch case.

C # Selection Statement Exercise 2