Line up numbers

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November 10th, 2012, 12:30 AM

Astrodude

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Line up numbers

How do I line up the numbers a user inputs into a column in such a way that the place values are guaranteed to align, regardless of the size of the integer?

I get:
5
145
7
45

I want:
_ _5
145
__7

etc

November 10th, 2012, 12:37 AM

salem

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Try say in C
printf("%5d\n", number);

Or in C++
cout << setw(5) << number << endl;

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November 10th, 2012, 10:14 PM

Astrodude

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Quote:

Originally Posted by salem

Try say in C
printf("%5d\n", number);

Or in C++
cout << setw(5) << number << endl;

Nope, doesn't work.

November 10th, 2012, 11:14 PM

salem

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> Nope, doesn't work.
Oh what a pity

November 10th, 2012, 11:56 PM

Astrodude

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Quote:

Originally Posted by salem

> Nope, doesn't work.
Oh what a pity

It doesn't change the spacing depending on the number of places. Whenever the numbers print, I get:

1
100
45

I need:
__1
100
_45

with __representing spaces. The %5d changes the spacing for all of the numbers, so they're still off balance. The only way I can conceive of doing it is to use a ton of if-statements and printf statements.

Remember, all values are integers.

November 11th, 2012, 12:41 AM

salem

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Perhaps you could remember to post your code.

"It doesn't work" is not a useful description of your problem.

November 11th, 2012, 12:45 AM

Astrodude

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Quote:

Originally Posted by salem

Perhaps you could remember to post your code.

"It doesn't work" is not a useful description of your problem.

Here you go!

Code:

for(i=0;i<size;i++)
{
	printf("     %5d     %5d\n",x[i],s[i]);
}
			printf("\nValue  Count\n");
			
for(i=0;i<d+1;i++)
{
	printf("   %5d -        %5d\n",v[i],c[i]);
}

November 11th, 2012, 02:04 AM

salem

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No idea - it works for me.

Code:

$ cat foo.c
#include <stdio.h>

int main(int argc, char *argv[])
{
    int x[10] = { 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000 };
    int i;
    for ( i = 0 ; i < 10 ; i++ ) {
        printf("%5d\n", x[i] );
    }
    return 0;
}
$ gcc foo.c
$ ./a.out 
    1
    2
    5
   10
   20
   50
  100
  200
  500
 1000

November 11th, 2012, 04:07 PM

Astrodude

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Quote:

Originally Posted by salem

No idea - it works for me.

Code:

$ cat foo.c
#include <stdio.h>

int main(int argc, char *argv[])
{
    int x[10] = { 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000 };
    int i;
    for ( i = 0 ; i < 10 ; i++ ) {
        printf("%5d\n", x[i] );
    }
    return 0;
}
$ gcc foo.c
$ ./a.out 
    1
    2
    5
   10
   20
   50
  100
  200
  500
 1000

Could the problem be that I'm trying to print out two columns?
I'm trying to get both columns, minus the "__" to be:

1 __1
5 __5
10 __14
20 __18
50 __145
100 etc
200
500
1000

#10

November 11th, 2012, 06:27 PM

Scorpions4ever

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One way to handle this is to check the return value of printf(). It returns the number of characters that it printed. That way, you can figure out how many spaces to print before printing the second number.

Code:

#define INDENT_WIDTH 10
int i, idx;

idx = printf("%d", first_number);
/* Now print as many spaces as needed to get to the next column */
for (i = idx; i < INDENT_WIDTH; i++) {
    printf(" ");
}
/* Now print the second number */
printf("%d\n", second_number);

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#11

November 11th, 2012, 08:40 PM

Lux Perpetua

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Quote:

Originally Posted by Astrodude

Could the problem be that I'm trying to print out two columns?

I'm confused. Multiple columns should line up as long as you don't exceed the field width. I saw your earlier post where you posted some code, but I still don't see what the problem is.

Code:

% cat test.c
#include <stdio.h>

int main(int argc, char *argv[])
{
    int x[10] = { 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000 };
    int i;
    for ( i = 0 ; i < 10 ; i++ ) {
        printf("%5d  %5d  %5d\n", x[i], x[i]*3, x[i]*7);
    }
    return 0;
}

% gcc -ansi -Wall -pedantic test.c
% ./a.out
    1      3      7
    2      6     14
    5     15     35
   10     30     70
   20     60    140
   50    150    350
  100    300    700
  200    600   1400
  500   1500   3500
 1000   3000   7000

#12

November 11th, 2012, 11:36 PM

salem

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> Could the problem be that I'm trying to print out two columns?
No, the problem is you can't be bothered to add a few more lines to your test code to make it a COMPLETE program we can run, and see the problem that you're seeing.

So instead there have been 3 separate guesses at trying to figure out what possible reason "%5d" isn't lining up for you.

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