java - Correct use for Switch? Menu option order a Sandwich OR Salad -
good morning/afternoon,
below code i've written java class ( in school homework ). i'm not here trying homework me.
my question is: can switch/case used how have set? prompt user input 1 or 2. answer 1 getting sandwich, answer 2 getting salad.
the instructions program starts customer order sandwich or salad. proceed add toppings additional charge , can decline toppings well.then print out order , total. professor specified use if statements , switch. however, have feeling missing because looks switch replacement of if statements in examples i've found on stack. thank , assistance!
import java.util.scanner; //loaded scanner take user input public class restaurant //dude change this, 3 outputs asking input 1 input 2 input 3 make if statements after { /* author: date: program: create class offer sandwich $7.00 optional 3 toppings lettuce, tomato, cheese $1.00 each or salad optional 2 toppings tomatos, cheese $0.50 each. */ public static void main(string[] args) { // declarations sandwich,salad,sandwich-cheese,sandwich-tomato,sandwich-lettuce, salad-cheese, salad-tomato. double sandwich = 7.00; double salad = 7.00; double sandche = 1.00; double sandtom = 1.00; double sandlet = 1.00; double salche = .50; double saltom = .50; int userinput; int userinput1; int userinput2; int userinput3; double sandtotal; double saladtotal; scanner scanner = new scanner(system.in); system.out.println("enter 1 sandwich or 2 salad"); int userinput = scanner.nextline(); switch(userinput) { case 1: // sandwich ordered system.out.println("enter 1 additional topping of lettuce or press 2"); int userinput1 = scanner.nextline(); system.out.println("enter 1 additional topping of cheese or press 2"); int userinput2 = scanner.nextline(); system.out.println("enter 1 additional topping of tomato or press 2"); int userinput3 = scanner.nextline(); if (userinput1 == 1 && userinput2 == 1 && userinput3 == 1) { saladtotal = (sandwich + sandlet + sandche + sandtom); system.out.println("your bill comes total of: " + sandtotal + " thank you, have great day!"); if (userinput1 == 1 && userinput2 == 2 && userinput3 == 2) { sandtotal = (sandwich + sandlet); system.out.println("your bill salad additional tomato toppings comes too: " + sandtotal + " thank you, have great day!"); if (userinput1 == 1 && userinput2 == 1 && userinput3 == 2) { sandtotal = (sandwich + sandlet + sandche); system.out.println("your bill salad no additional toppings comes too: " + salad + " thank you, have great day!"); if (userinput1 == 1 && userinput2 == 2 && userinput3 == 1) { sandtotal = (sandwich + sandlet + sandtom ); system.out.println("your bill sandwich `enter code here`lettuce , tomato comes too: " + sandtotal + " thank you, have great day!"); if (userinput1 == 2 && userinput2 == 1 && userinput == 1) { sandtotal = (sandwich + sandche + sandtom); system.out.println("your bill sandwich cheese , tomato comes too: " + sandtotal + " thank you, have great day!"); if (userinput1 == 2 && userinput2 == 2 && userinput3 == 2) { system.out.println("your bill sandwich comes too: " + sandwich + " thank you, have great day!"); }// end if 1 }//end if 2 }//end if 3 }//end if 4 }//end if 5 }//end if 6 } } } // switch case below case 2: // salad ordered { system.out.println("press 1 additional topping of cheese or press 2"); int userinput1 = scanner.nextline(); system.out.println("press 1 additional topping of tomato or press 2"); int userinput2 = scanner.nextline(); if (userinput1 == 1 && userinput2 == 2) { saladtotal = (salad + salche); system.out.println("your bill comes total of: " + saladtotal + " thank you, have great day!"); if (userinput1 == 2 && userinput2 == 1) { saladtotal = (salad + saltom); system.out.println("your bill salad additional tomato toppings comes too: " + saladtotal + " thank you, have great day!"); if (userinput1 == 2 && userinput2 == 2) { system.out.println("your bill salad no additional toppings comes too: " + salad + " thank you, have great day!"); if (userinput1 == 1 && userinput2 == 1) { saladtotal = (salad + salche + saltom ); system.out.println("your bill salad tomato , cheese toppings comes too: " + saladtotal + " thank you, have great day!"); }//end if 1 }//end if 2 }//end if 3 }//end if 4 } }// end of class
in general, switch-case statements , if/else blocks interchangeable. switch-cases bit different because of use of break (an example below). though in cases if-statements used. use switch-case handling cases based on enumerations.
lets have enumeration foodtype:
public enum foodtype { sandwitch, salad, fruit } so if want ask user questions based on food chooses, this:
foodtype chosentype = foodtype.sandwitch; // can user input switch (chosentype) { case sandwitch: system.out.println("you want cheese?"); case salad: system.out.println("sauce?"); break; case fruit: system.out.println("which one?"); break; default: throw new illegalstateexception(); } note here:
- when sandwitch chosen, questions 'you want cheese?' , 'sauce?' printed, because there no
breakstatement. - when fruit chosen, 'which one?' printed.
defaulthappen, if user chose somthing else, not sandwitch or salad or fruit.
you of course write if statements well:
if (foodtype.salad.equals(chosentype)) {...} when there few cases rater use simple if statements. also, code inside 'case' should not overly long/complicated. think if want know when use statement; there sure blog posts or stackoverflow answers.
// sidenote: aware default: not reachable code in example.
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