CODEWITHSUNDEEP
java
BubbleTree
BubbleTree

Reputation: 606

Array operations?

I want to know if there is something similar to (input==(letters[i]-'c')) that i can use. I know what i type doesn't make sense but i'm trying to create something similar to that. If the user's input is anything in the array but c, then it displays the first message, else if it is c, then it displays the second message. I just want to somehow temporarily exclude c from the array and have the program check all other elements...

char []letters={'a','b','c','d'};
//input is user input

for(int i=0;i<letters.length<;i++)
   if(input==(letters[i]-'c'))
   {
     system.out.print("input might be a,b,d but not c");
   }
   else if(input=='c')
   {
     system.out.print("input is c");
     break;
   }

Upvotes: 0

Views: 299

Answers (4)

Victor Mukherjee
Victor Mukherjee

Reputation: 11065

String str=Arrays.toString(letters).replaceAll("\\s*\\[*,*\\]*", "");
if(input=='c') {
    system.out.println("input is c");
}
else if(str.contains(""+input)) {
    system.out.print("input might be a,b,d but not c");
}

Upvotes: 0

RNJ
RNJ

Reputation: 15552

You could convert it to a list and then use the contains method

This will return true or false. You can use this in your if statement.

eg

if (Arrays.asList('a', 'b', 'c').contains('c')) {
   System.out.print("input might be a,b,d but not c");
}
else {
   System.out.print("input is c");
}

(btw your code sample does not compile. System should have a capital letter)

Upvotes: -1

David Grant
David Grant

Reputation: 14243

Try the following:

Arrays.sort(letters);
if (Arrays.binarySearch(letters, 'c') >= 0) {
    // contains 'c'
} else {
    // doesn't contain 'c'
}

Please note that the call to binarySearch requires the array to be sorted first, hence sort.

Upvotes: 4

Peter Lawrey
Peter Lawrey

Reputation: 533790

Normally what you would do is use a String for text.

//input is user input
String letters = "abcd";

if (letters.contains("c")) 
    System.out.print("input contains c");
else
    System.out.print("input doesn't contain c");

Upvotes: 0

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