two dimensional arrays

[msdevifaiyaz]

hi,
i have simple problem plz solve. i want to print the following output. in 2d arrays.
1 8 9 16
2 7 10 15
3 6 11 14
4 5 12 13

can anybody solve this prblm send. this question answer. plz
i will b grateful 2 u.

[Meetee]

hi,
i have simple problem plz solve. i want to print the following output. in 2d arrays.
1 8 9 16
2 7 10 15
3 6 11 14
4 5 12 13

can anybody solve this prblm send. this question answer. plz
i will b grateful 2 u.

Hi,

You can take 4x4 two dimensional array and insert values in such a manner that a[0][0]=1 .....a[4][4]=13. Have you tried some code?. As I can help you in that code. I cannot write full code according the rule of this forum.

Regards

[JosAH]

Basically you're zig-zagging through that matrix; every time you hit a 'wall' you
change the y-direction. A single loop and a few if-statements can do the job:

+   +---+   +
|   |   |   |
+   +   +   +
|   |   |   |
+   +   +   +
|   |   |   |
+---+   +---+
 

kind regards,

Jos

[weaknessforcats]

Also, be aware that your 2D array is in memory this way:

1 8 9 16 2 7 10 15 3 6 11 14 4 5 12 13

You could treat it as a 1D array and just display 4 numbers per line.

C++ really only has 1D arrays. An int [4] array has 4 elements where each element is an int. An int [4][4] is still an array of 4 elements but each element is an array of 4 int.

Arrays are in memory contiguously as element 0 1 2 3.

[msdevifaiyaz]

Hi,

You can take 4x4 two dimensional array and insert values in such a manner that a[0][0]=1 .....a[4][4]=13. Have you tried some code?. As I can help you in that code. I cannot write full code according the rule of this forum.

Regards

here i have written some code plz help me

# include<iostream.h>
#include<conio.h>

void main()
{
int a[4][4] ;
int i, j;
clrscr();
for(i=0;i<4;i++)
for(j=0;j<4;j++)
{
cout<<"Enter the value for dimension arrays " ;
cin>>a[i] [j] ;
}
for(i=0;i<4;i++)
{
cout<<endl;
for(j=0;j<4;j++)
cout<<a[j][i]<<"\t";
}
getch();
}

the output of this coming like this

1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16

plz help me.

[msdevifaiyaz]

Also, be aware that your 2D array is in memory this way:

1 8 9 16 2 7 10 15 3 6 11 14 4 5 12 13

You could treat it as a 1D array and just display 4 numbers per line.

C++ really only has 1D arrays. An int [4] array has 4 elements where each element is an int. An int [4][4] is still an array of 4 elements but each element is an array of 4 int.

Arrays are in memory contiguously as element 0 1 2 3.

here i have written some code plz help me

# include<iostream.h>
#include<conio.h>

void main()
{
int a[4][4] ;
int i, j;
clrscr();
for(i=0;i<4;i++)
for(j=0;j<4;j++)
{
cout<<"Enter the value for dimension arrays " ;
cin>>a[i] [j] ;
}
for(i=0;i<4;i++)
{
cout<<endl;
for(j=0;j<4;j++)
cout<<a[j][i]<<"\t";
}
getch();
}

the output of this coming like this

1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16

plz help me.

[msdevifaiyaz]

Also, be aware that your 2D array is in memory this way:

1 8 9 16 2 7 10 15 3 6 11 14 4 5 12 13

You could treat it as a 1D array and just display 4 numbers per line.

C++ really only has 1D arrays. An int [4] array has 4 elements where each element is an int. An int [4][4] is still an array of 4 elements but each element is an array of 4 int.

Arrays are in memory contiguously as element 0 1 2 3.

here i have written some code plz help me

# include<iostream.h>
#include<conio.h>

void main()
{
int a[4][4] ;
int i, j;
clrscr();
for(i=0;i<4;i++)
for(j=0;j<4;j++)
{
cout<<"Enter the value for dimension arrays " ;
cin>>a[i] [j] ;
}
for(i=0;i<4;i++)
{
cout<<endl;
for(j=0;j<4;j++)
cout<<a[j][i]<<"\t";
}
getch();
}

the output of this coming like this

1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16

plz help me.

[msdevifaiyaz]

Basically you're zig-zagging through that matrix; every time you hit a 'wall' you
change the y-direction. A single loop and a few if-statements can do the job:

+   +---+   +
|   |   |   |
+   +   +   +
|   |   |   |
+   +   +   +
|   |   |   |
+---+   +---+
 

kind regards,

Jos

here i have written some code plz help me

# include<iostream.h>
#include<conio.h>

void main()
{
int a[4][4] ;
int i, j;
clrscr();
for(i=0;i<4;i++)
for(j=0;j<4;j++)
{
cout<<"Enter the value for dimension arrays " ;
cin>>a[i] [j] ;
}
for(i=0;i<4;i++)
{
cout<<endl;
for(j=0;j<4;j++)
cout<<a[j][i]<<"\t";
}
getch();
}

the output of this coming like this

1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16

plz help me.

[Meetee]

here i have written some code plz help me

# include<iostream.h>
#include<conio.h>

void main()
{
int a[4][4] ;
int i, j;
clrscr();
for(i=0;i<4;i++)
for(j=0;j<4;j++)
{
cout<<"Enter the value for dimension arrays " ;
cin>>a[i] [j] ;
}
for(i=0;i<4;i++)
{
cout<<endl;
for(j=0;j<4;j++)
cout<<a[j][i]<<"\t";
}
getch();
}

the output of this coming like this

1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16

plz help me.

If you want to print like
1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16
Then just change your loop like

for(j=0;j<4;j++)
{
cout<<endl;
for(i=0;i<4;i++)
cout<<a[i][j]<<"\t";
}
 

also change void main() to int main() and return 0 at end.

regards

PS: Do not post for more than one time please.

[JosAH]

@OP: I have removed your other thread concerning this very same problem.
Please stick to one thread for one problem and please don't repeat yourself
when you're under stress. Have you considered my hint in my previous reply?

kind regards,

Jos

[msdevifaiyaz]

If you want to print like
1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16
Then just change your loop like

for(j=0;j<4;j++)
{
cout<<endl;
for(i=0;i<4;i++)
cout<<a[i][j]<<"\t";
}
 

also change void main() to int main() and return 0 at end.

regards

PS: Do not post for more than one time please.

BT I DON'T PRINT LIKE THIS I WANT 2 PRINT LIKE THIS

here i have written some code plz help me

# include<iostream.h>
#include<conio.h>

void main()
{
int a[4][4] ;
int i, j;
clrscr();
for(i=0;i<4;i++)
for(j=0;j<4;j++)
{
cout<<"Enter the value for dimension arrays " ;
cin>>a[i] [j] ;
}
for(i=0;i<4;i++)
{
cout<<endl;
for(j=0;j<4;j++)
cout<<a[j][i]<<"\t";
}
getch();
}

the output of this coming like this

1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16

BT I want output to PRINT LIKE THIS

1 8 9 16
2 7 10 15
3 6 11 14
4 5 12 13

[JosAH]

@OP: I have removed your other identical thread again; you should stop double
posting now. Read the guidelines (top right corner, the 'Help' link). and see the
risk for double posting over and over again.

Here's a hint (it's more of a spoiler actually): if you subtract 1 from every number
you get the numbers 0, 1, 2, ... 15. Exclusive or the numbers in the second and
fourth columns with the two lowest bits, i.e. 3 or '11' in binary; do it by hand and
watch the results. Then reverse the operations and voila.

kin regards,

Jos

[msdevifaiyaz]

@OP: I have removed your other identical thread again; you should stop double
posting now. Read the guidelines (top right corner, the 'Help' link). and see the
risk for double posting over and over again.

Here's a hint (it's more of a spoiler actually): if you subtract 1 from every number
you get the numbers 0, 1, 2, ... 15. Exclusive or the numbers in the second and
fourth columns with the two lowest bits, i.e. 3 or '11' in binary; do it by hand and
watch the results. Then reverse the operations and voila.

kin regards,

Jos

BT I DON'T PRINT LIKE THIS I WANT 2 PRINT LIKE THIS

here i have written some code plz help me

# include<iostream.h>
#include<conio.h>

void main()
{
int a[4][4] ;
int i, j;
clrscr();
for(i=0;i<4;i++)
for(j=0;j<4;j++)
{
cout<<"Enter the value for dimension arrays " ;
cin>>a[i] [j] ;
}
for(i=0;i<4;i++)
{
cout<<endl;
for(j=0;j<4;j++)
cout<<a[j][i]<<"\t";
}
getch();
}

the output of this coming like this

1 5 9 13
2 6 10 14
3 7 11 15
4 8 12 16

BT I want output to PRINT LIKE THIS

1 8 9 16
2 7 10 15
3 6 11 14
4 5 12 13

[JosAH]

BT I DON'T PRINT LIKE THIS I WANT 2 PRINT LIKE THIS

here i have written some code plz help me

I gave you the golden tip (read: spoiler) already. Are you actually able to read
or do you just like to repeat yourself over and over again?

kind regards,

Jos

[msdevifaiyaz]

hi,

i have written coding plz change the coding and print the output.
# include<iostream.h>
#include<conio.h>

void main()
{
int a[4][4] ;
int i, j;
clrscr();
for(i=0;i<4;i++)
for(j=0;j<4;j++)
{
cout<<"Enter the value for dimension arrays " ;
cin>>a[i] [j] ;
}
for(i=0;i<4;i++)
{
cout<<endl;
for(j=0;j<4;j++)
cout<<a[j][i]<<"\t";
}
getch();
}

plz change the coding the output should be like this

1 8 9 16
2 7 10 15
3 6 11 14
4 5 12 13

[JosAH]

hi,

i have written coding plz change the coding and print the output.

No, we don't handout code solutions here; but I bet you haven't even read my
hint (see above). otherwise you would have noticed that for the numbers
4, 5, 6, 7 exclusived or-ed with the value 3, you'd get 7, 6, 5, 4 and similar with
the values 12, 13, 14, 15, exclusive or-ed with the value 3, the result is:
15, 14, 13, 12. Only do this trick for odd column index values.

kind regards,

Jos