printf justification of printed values

[bahadir.balban]

Hi,

I checked the C reference manual, but cannot find the right solution
for my printfs.

If I have a print of the format <field: value> such as

printf("Field: %x", val); or
printf("%s%x","Field:",val);

I want the "Field:" string to be padded on its right hand side, such
that, no matter how long the field string is, the value will appear in
the same column. How do I go doing that?

Thanks,
Bahadir

 

[S.Tobias]

printf("Field: %x", val); or
printf("%s%x","Field:",val);

I want the "Field:" string to be padded on its right hand side, such
that, no matter how long the field string is, the value will appear in
the same column. How do I go doing that?

Wouldn't this example do what you want?
printf("%-20s%x", "Field:", val);

 

[Bilgehan.Balban]

Yes this was just what I needed.

Thanks,
Bahadir

 

[Robert W Hand]

Yes this was just what I needed.

You can determine the width dynamically, too, if you cannot estimate a
proper field width at compile time.

printf("%-*s: %*x\n", widthS, field, widthI, value);

The '*' are supplied by widthS and widthI, int objects whose values
are determined programmatically to be a maximal field width for the
two other objects field and value. Spending a little more computer
time to make your output human readable can be well-worth it. HTH.