how nested loop works?

[dolly shah]

public class JMM113 {
 
  public static void main (String[] args) {
    int i = 0, j = 0, k = 0;
    do while (i++ < 3)
      System.out.print(k++);
    while (j++ < 3);
      
}}

Answer-012

I just want to understand how the nested loop works? In above example value of j is evaluated at every while loop iteration or not? Can anyone explain please?

[dennis zined]

Howdy!

first, arrange the code in a more readable way. this helps to better understand what the code is trying to do:

public class JMM113 {
    public static void main (String[] args) {
        int i = 0, j = 0, k = 0;
        do
            while (i++ < 3)
                System.out.print(k++);
        while (j++ < 3);
    }
}

In the code above, you'll see that the do/while loop contains an inner while loop. In the first iteration of the outer loop, the inner loop is executed and prints out k values: 012. In the second iteration (j is incremented), i is evaluated and since its value no longer satisfies the 'i++ < 3' condition (by virtue of the previous iteration), the inner loop does not execute and k value is never printed. 'j' again is incremented and performs another loop and so on.

hope this helps.

[dolly shah]

Thanks.
I have one another doubt.

class JMM117 {
  public static void main (String[] args) {
    int i = 0, j = 9;
    do {
      i++;
      if (j-- < i++) {break;}
    } while (i < 5);
    System.out.print(i + "," + j);
}}

How it's answer is "6,6"? I am not getting. Can anyone explain please?

[V Gala]

class JMM117
{ public static void main (String[] args)
{ int i = 0, j = 9;
do {
i++;
System.out.println(" before if "+i+ ","+j);

if (j-- < i++) {break;}
System.out.println("After if "+i+ ","+j);
}
while (i < 5);
System.out.print("After do while"+i + "," + j);
}}

try this
you will understand