Can You Have A Return And A Formula In A Ternary?-CodePudding

   public boolean hasOne(int n) {
      while(n != 0) {
         (n % 10 == 1)? return true : n /= 10;

      }

      return false;
  }

I'm trying to check if there is a "1" in the number sent.

CodePudding user response：

You can't do that. Why not do

return Integer.toString(n).contains("1");

CodePudding user response：

That makes no sense.

First of all, you have to understand the difference between a 'statement' and an 'expression'.

return is a statement, possibly containing an expression after the keyword.

The conditional operator (its proper name, not "the operator with three operands") is used in an expression.

What you have written is:

<expression> ?  <statement> : <expression>

-or-

<expression> ?  <statement> : <statement>

(the second expression could be an expression statement).

There is no such syntax in Java. What you want is expressed with an 'if` statement, simply and clearly.

 if (n % 10 == 1)
     return true;
 else
     n /= 10;

An expression using the conditional operator is not interchangeable with an if-else statement.