CODEWITHSUNDEEP
javaif-statement
user4212315
user4212315

Reputation:

Multiple if statements on one line

How does a statement like this execute?

int x = 2, y = 3;

if (x != 0) if (x < 10) if (y < 10) {
    x++;
    y++;
    System.out.printf("X and Y are: %d, and %d", x, y);
}

Upvotes: 2

Views: 8598

Answers (9)

Alex Webber
Alex Webber

Reputation: 1

Using Java Logical Operators will resolve your problem.
Click this link to learn more
http://www.cafeaulait.org/course/week2/45.html

Upvotes: 0

Elliott Frisch
Elliott Frisch

Reputation: 201409

They're nested. Basically, the curly brace is optional for one line statement blocks. I assume y < 1o should be y < 10, also your println looks suspicious.

if (x != 0) {
  if (x < 10) {
    if (y < 10) {
      x++;
      y++;
      // System.out.println(x, y);
      System.out.println(Integer.toString(x) + " " + y);
    }
  }
}

You could certainly combine those into a single if (and even one line) with an and like

if (x != 0 && x < 10 && y < 10) {
  System.out.printf("%d %d%n", x++, y++);
}

Upvotes: 0

viggy22
viggy22

Reputation: 59

It operates like a nested if as said by Andy. Instead of using this write all the conditions in one if statement and use && operator.

Upvotes: 0

Orangelight
Orangelight

Reputation: 147

Just use the && operator 

int x = 2, y = 3;
if (x != 0 && x < 10 && y < 10) {
    x++;
    y++;
    System.out.println(x, y);
}

Upvotes: 0

Johny
Johny

Reputation: 2188

this is similar to 

if (x != 0) {
   if (x < 10) {
      if (y < 10) {
        x++;
        y++;
        System.out.println(x, y);
      }
   }
}

in an alternate way you can write

if((x != 0) && (x < 10) && (y < 10)) {
   x++;
   y++;
   System.out.println(x, y);
}

Upvotes: 0

Elton
Elton

Reputation: 93

if () if() if() is just short hand what it is really doing is 

if(x != 0){
    if(x < 10){
        if(y < 1o){
            x++;
            y++;
            System.out.println(x, y);
        }else{}
    }else{}
}else{}

Upvotes: 0

Chiseled
Chiseled

Reputation: 2300

It operates like a Nested if. Why dont you check all condtion in the first if using a conditional AND. This way you would not need others.

However its a good practice to have braces for each if. This way its more readable and less error prone when the code undergoes changes in the future

Upvotes: 0

Andy Thomas
Andy Thomas

Reputation: 86381

If it could be compiled, it would get executed exactly like this:

if (x != 0) 
   if (x < 10) 
     if (y < 1o) {
        x++;
        y++;
        System.out.println(x, y);
     }

However, it's not very readable. You could improve its readability by using logical operators or proper line breaks and indentation.

Upvotes: 2

Lawrence Aiello
Lawrence Aiello

Reputation: 4638

Like this:

int x = 2, y = 3;
if ((x != 0) && (x < 10) && (y < 10))
{
    x++;
    y++;
    System.out.println(x, y);
}

Upvotes: 1

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