Buy books for class practice at a discounted price

First, design ideas

When the number of books to buy more than five, want to make the cheapest price, it must be as far as possible to make the book into a set of books, that is, can be continuous sets, so that can be guaranteed to enjoy more discount concessions, so:

When buying 6 books, choose the purchase method is: Five this set, plus a single book, 5+1;

When buying 7 books, the choice of purchase method is: 5+2;

When buying 8 books, the choice of purchase method is: 4+4;

When buying 9 books, the choice of purchase method is: 5+4;

When more than 10 books are available, you can use the method above, and so on.

Second, the program code

1 ImportJava.util.*;2 classBargain3 {4      Public Static voidMain (string[] args)5     {6         Doublesum = 0; 7System.out.println ("Please enter the number you want to buy:");8Scanner sc =NewScanner (system.in);9         intnum =sc.nextint ();Ten  One         if(num<=5)//no more than five copies of the purchase book A         { -            Switch(num) -            { the             Case1: -sum=8;//No discount -             Break; -             Case2: +sum=2*8*0.95;//95 percent -             Break; +             Case3: Asum=3*8*0.9;//90 percent at             Break; -             Case4: -sum=4*8*0.8;//80 percent -             Break; -             Case5: -sum=5*8*0.75;//75 percent in             Break; -            } to         } +         if(num>5&&num<=9) -         { thesum=method (num);  *         } $         if(num>=10)//more than 10 books boughtPanax Notoginseng         { -             Switch(num%5) the            { +                  Case0: ASum= (NUM/5) *8*5*0.75; the                  Break; +                  Case1: -Sum= (num/5-1) *8*5*0.75+method (6); $                  Break; $                  Case2: -Sum= (num/5-1) *8*5*0.75+method (7); -                  Break; the                  Case3: -Sum= (num/5-1) *8*5*0.75+method (8);Wuyi                  Break; the                  Case4: -Sum= (num/5-1) *8*5*0.75+method (9); Wu                  Break; -            } About         } $  -System.out.println ("The cheapest price is:" +sum+ "Yuan"); -     } -  A  +      Public Static DoubleMethodintA//The number of books to buy is 6, 7, 8, 9 the     {    -         DoubleMin = 0; $         inttemp = a%5; the         Switch(temp) the         { the              Case1: theMin=5*8*0.75+8; -              Break; in              Case2: themin=5*8*0.75+2*8*0.95; the              Break; About              Case3: themin=4*8*0.8+4*8*0.8; the              Break; the              Case4: +min=5*8*0.75+4*8*0.8; -              Break;  the         }Bayi         returnmin;  the     } the}

Iii. Results

Iv. New Experience

In thinking of this idea, at the beginning of this thinking is very complex, think that the need to consider the book, but also to determine the type of books, but after testing a few, found that there is no need to consider this, you can directly consider the purchase of books can be made into a set of books, so that the natural can get the lowest price, But when the modulus 5 is 8 of the case, is more special, the last two or to be divided into 4+4, so there is no problem

Buy books for class practice at a discounted price