Unable to understand certain codes.

Question

1.00/5 (1 vote)

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So here are 2 programs that our teacher taught us today but can't figure out how to do it.

First:

void main()
{ 
 for(int i=1; i<=5; ++i)
 {
  for(int j=1; j<=1; ++j)
  cout<<j<<"";
  cout<<'\n';
 }
}

So it should print this:
1
12
123
1234
12345

Second:

void main()
{ 
 for(int i=5; i>=1; --i)
 {
  for(int j=1; j<=1; ++j)
  cout<<j<<"";
  cout<<'\n';
 }
}

And this must do:
12345
1234
123
12
1

If you can only explain the first one, it will be great either. I can figure out the second one.

Posted 23-Sep-15 1:16am

Onusmoon

Updated 23-Sep-15 1:43am

v3

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Comments

CHill60 23-Sep-15 7:30am

If you can figure out the second one then you should be able to figure out the first one! Which bit are you stuck with?

barneyman 23-Sep-15 7:32am

neither make sense and will do what's posited

the second won't even compile

Onusmoon 23-Sep-15 7:44am

@CHill60 I meant that if you can explain the 1st code, I can later try to understand the second one. And I am not able to understand anything.

phil.o 23-Sep-15 7:52am

And what your teacher told you when you asked him for clarifications?

Onusmoon 23-Sep-15 8:04am

he just repeated everything that he wrote and dummmmmmmmmmm

2 solutions

Solution 2

Hi,

Your both codes are wrong.

C#

void main()
{
 for(int i=1; i<=5; ++i)
 {
  for(int j=1; j<=i; ++j)
  cout<<j<<"";
  cout<<'\n';
 }
}

In the second for loop the condition should include "i" not "1".

Here the forst loop goes on and in the 2nd loop the values get printed as 1.
In the 2nd iteration the value of i=2.
So it will print 12.
like wise it will go on printing till the outer loop condition satisfies.
If you can able to learn dry run then it would help you in developing logic. its not advisable to get help every time from such forums.

Thanks,
Sisir Patro

Posted 23-Sep-15 1:40am

Sisir Patro

Updated 23-Sep-15 1:51am

v2

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barneyman · Accepted Answer · 2015-09-23T01:38:00

if i fix them, maybe they'll make more sense?

C++

void main()
{
 for(int i=1; i<=5; ++i)
 {
// was j<=1, should be j<=i
  for(int j=1; j<=i; ++j)
  {
   cout<<j<<"";
  }
  cout<<'\n';
 }
}

C++

void main()
{
 // was i<>=1, should be i!=1
 for(int i=5; i!=1; --i)
 {
  // was j<=1, should be j<=i
  for(int j=1; j<=i; ++j)
  {
    cout<<j<<"";
  }
  cout<<'\n';
 }
}