having trouble with for loop

[hummingdev]

Hi everyone, hope you're doing well. Im new here so please go easy on me
I am having trouble printing out a table that should look like this

****************************************************************************************|
 height | base  | Cross-sectional area  |   Moment of inertia   | Section modulus       |
  cm    |  cm   |     base x height     |  (base x height^3)/12 | (base x height)/6     |
----------------------------------------------------------------------------------------|
  2     |   2   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  4     |   2   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  6     |   2   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  8     |   2   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  10    |   2   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  12    |   2   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  2     |   4   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  4     |   4   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  6     |   4   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  8     |   4   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  10    |   4   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  12    |   4   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  2     |   6   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  4     |   6   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  6     |   6   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  8     |   6   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  10    |   6   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  12    |   6   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  2     |   8   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  4     |   8   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  6     |   8   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  8     |   8   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  10    |   8   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  12    |   8   |                       |                       |                       |
-----------------------------------------------------------------------------------------
  2     |   10  |                       |                       |                       |
-----------------------------------------------------------------------------------------
  4     |   10  |                       |                       |                       |
-----------------------------------------------------------------------------------------
  6     |   10  |                       |                       |                       |
-----------------------------------------------------------------------------------------
  8     |   10  |                       |                       |                       |
-----------------------------------------------------------------------------------------
  10    |   10  |                       |                       |                       |
-----------------------------------------------------------------------------------------

but I end up with much longer table and this is my code for the table

#include<stdio.h>
int main()
{
    int z;
    int y;
    int i;
    printf("****************************************************************************************|");
    printf("\n height | base  | Cross-sectional area  |   Moment of inertia   | Section modulus\t|");
    printf("\n  cm    |  cm   |     base x height     |  (base x height^3)/12 | (base x height)/6     |");
    printf("\n----------------------------------------------------------------------------------------|");
    for(z=1;z<=6;z++)
   {
       for(i=2;i<=10;i+=2)
       for(y=2;y<=12;y+=2)
     printf("\n  %d\t|   %d\t|\t\t\t|\t\t\t|\t\t\t|\n-----------------------------------------------------------------------------------------",y,i);
   }
   printf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
 return 0;
}

[africanwizz]

6*10*12 = 144

[stahta01]

What is the purpose of the outer for loop?
for(z=1;z<=6;z++)

Tim S.

[hummingdev]

What is the purpose of the outer for loop?
for(z=1;z<=6;z++)

Tim S.

it's oky I kinda fixed it

#include<stdio.h>



int main()
{


    double y;
    double i;




    printf("****************************************************************************************|");
    printf("\n height | base  | Cross-sectional area  |   Moment of inertia   | Section modulus\t|");
    printf("\n  cm    |  cm   |     base x height     |  (base x height^3)/12 | (base x height)/6     |");
    printf("\n________________________________________________________________________________________|");










       for(i=2;i<=10;i+=2){
       for(y=2;y<=12;y+=2)
        printf("\n  %.0f\t|   %.0f\t|\t%.2f\t\t|\t%.2f\t\t|\t%.2f\t\t|\n________________________________________________________________________________________",y,i,i*y,(i*y*y*y)/12,(i*y)/6);


}


   printf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
 return 0;
}

Im starting out on c so I may have made some silly mistakes but thanks guys if my code have other mistakes please do and tell me so I can learn from it
although the above code runs fine without errors or warnings
thanks again

[Matticus]

This may or may not be important, but the horizontal lines in your table does not actually match the horizontal lines you described in your first post.

// first post table formatting:

--------------
  xx  |  xx  |
--------------
  xx  |  xx  |
--------------

// your table formatting

______________
  xx  |  xx  |
______________
  xx  |  xx  |
______________

Also, you can break your "printf()" up into several "printf()" statements to make it a little bit easier to read.

And - rather than manually adding whitespace before each floating-point number, you can use the width modifier in addition to the precision modifier. Not only does this eliminate the need for adding manual whitespace in those spots, you can also make the decimal points line up nicely. Here is a modified version of your "printf()" statement:

printf("\n%3.0f\t|%4.0f\t|%11.2f\t\t|%11.2f\t\t|%11.2f\t\t|\n________________________________________________________________________________________",y,i,i*y,(i*y*y*y)/12,(i*y)/6);

If you wanted to get really fancy, you could write code that does not contain any hard-coded whitespace, but instead calculates how much whitespace is needed, and use the wild-card width specifier (though if you're still new to learning, this might be a bit over your head):

*

The width is not specified in the format string, but as an additional integer value argument preceding the argument that has to be formatted.

(source)

[hummingdev]

This may or may not be important, but the horizontal lines in your table does not actually match the horizontal lines you described in your first post.

// first post table formatting:

--------------
  xx  |  xx  |
--------------
  xx  |  xx  |
--------------

// your table formatting

______________
  xx  |  xx  |
______________
  xx  |  xx  |
______________

Also, you can break your "printf()" up into several "printf()" statements to make it a little bit easier to read.

And - rather than manually adding whitespace before each floating-point number, you can use the width modifier in addition to the precision modifier. Not only does this eliminate the need for adding manual whitespace in those spots, you can also make the decimal points line up nicely. Here is a modified version of your "printf()" statement:

printf("\n%3.0f\t|%4.0f\t|%11.2f\t\t|%11.2f\t\t|%11.2f\t\t|\n________________________________________________________________________________________",y,i,i*y,(i*y*y*y)/12,(i*y)/6);

If you wanted to get really fancy, you could write code that does not contain any hard-coded whitespace, but instead calculates how much whitespace is needed, and use the wild-card width specifier (though if you're still new to learning, this might be a bit over your head):

"but the horizontal lines in your table does not actually match the horizontal lines you described in your first post."
It's ok because I changed them


and also thank you so much for clarifying how I should use width modifier, you're a life saver