Multiple if statements on one line

Question

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);
}

You can put all that in one statement using the `&&` operator. — Jesus Ramos, Nov 04 '14 at 22:53
"*How does a statement like this execute?*" It will not execute because it will not compile because of `System.out.println(x, y);`. — Pshemo, Nov 04 '14 at 22:59
possible duplicate of [Multiple 'If' statements?](http://stackoverflow.com/questions/22523157/multiple-if-statements) — aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, Nov 04 '14 at 23:57

score 2 · Accepted Answer · answered Nov 04 '14 at 22:55

2

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.

answered Nov 04 '14 at 22:55

Andy Thomas

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2

System.out.println(x, y);?? – while true Nov 04 '14 at 22:56
@whiletrue You should be asking OP about it, not Andy. – Pshemo Nov 04 '14 at 22:57
@whiletrue - Good point. The "1o" would be another compiler error. – Andy Thomas Nov 04 '14 at 22:58
1

@AndyThomas i'm surprised all answers contain that – while true Nov 04 '14 at 23:00

score 1 · Answer 2 · answered Nov 04 '14 at 22:55

1

Like this:

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

answered Nov 04 '14 at 22:55

Lawrence Aiello

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5
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score 0 · Answer 3 · answered Nov 04 '14 at 22:55

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

score 0 · Answer 4 · answered Nov 04 '14 at 22:56

0

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{}

answered Nov 04 '14 at 22:56

Elton

83
7

not including braces just means the next statement is considered as the body of the if statement. This is bad practice because what they could have done instead is just if( case && case && case){//do stuff} – Elton Nov 04 '14 at 22:58

Elliott Frisch · Answer 5 · 2014-11-04T23:02:03.197

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++);
}

score 0 · Answer 6 · answered Nov 04 '14 at 22:57

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);
}

score 0 · Answer 7 · answered Nov 04 '14 at 22:57

0

Just use the && operator

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

answered Nov 04 '14 at 22:57

Orangelight

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score 0 · Answer 8 · answered Nov 04 '14 at 22:58

0

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.

answered Nov 04 '14 at 22:58

viggy22

59
3

score 0 · Answer 9 · answered Nov 04 '14 at 23:02

0

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

answered Nov 04 '14 at 23:02

Alex Webber

1
2

Multiple if statements on one line

9 Answers9