Understanding nested forloops

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1.00/5 (1 vote)

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Hi,

I am trying to better understand nested loops.

Say I have a for loop for time, this instance a parent loop as follows:

C#

int i;
int j;

for (int i = 0; i <=99; i++)
{
  for (j = 0; i <=99; j++)
  {
    blahh...
  }
}

In this instance does this mean that for every repition of variable i, variable j gets executed?

A tad confusing.

Cheers
Keil

Posted 28-Apr-14 17:42pm

[NOPE]FOREV3R

Updated 28-Apr-14 17:51pm

v2

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Laiju k 28-Apr-14 23:46pm

for i=0 => j 0-99 loops works
then for i=1 it continues till i=99 j=99

Аslam Iqbal 29-Apr-14 0:21am

Inner loop is infinite..................................................

4 solutions

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Abhinav S · Answer 1 · 2014-04-28T18:17:00

Solution 4

All the steps in the inner loop gets executed for every single execution of the outer loop.

Posted 28-Apr-14 18:17pm

Abhinav S

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 2 · 2014-04-28T17:58:00

Solution 1

Quote:
In this instance does this mean that for every repition of variable i, variable j gets executed?

Yes, you are right. Ideally it should happen.

For every i, inner loop should continue till j is 99.

But you have a problem here. The inner loop checks the condition i<=99, which is wrong. You should check j<=99.

C#

for (j = 0; i <=99; j++)

Posted 28-Apr-14 17:58pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Updated 28-Apr-14 19:26pm

v2

Comments

Аslam Iqbal 29-Apr-14 0:20am

Inner loop continues to infinite time. here for (j = 0; i <=99; j++) no increment for i. So, i<99 is always true.

Laiju k 29-Apr-14 0:28am

you are right to the question.but we have to use j in the condition instead of i.
then only it will work on j's values else it is infinite as you said.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 29-Apr-14 1:23am

Yes, my mistake. Just a eye slip. :P
Updating my answer now.

DamithSL · Answer 3 · 2014-04-28T18:08:00

Solution 2

add console write line as below, you can see the how each iteration values are changing

C#

for (int i = 0; i <=99; i++)
{
  for (j = 0; j <=99; j++)
  {
    Console.WriteLine(string.Format("i={0}, j={1}", i,j));
  }
}

Posted 28-Apr-14 18:08pm

DamithSL

Updated 28-Apr-14 18:42pm

v2

RahulMGunjal · Answer 4 · 2014-04-28T18:14:00

Solution 3

It will execute 10000 (100X100) time!

Posted 28-Apr-14 18:14pm

RahulMGunjal