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How to right pad with zeros using sprintf?

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# 1  
Old 09-20-2010
How to right pad with zeros using sprintf?
I need to right-pad with zeros a string by using (s)printf.

I looked up the manual and tried with

Code:
printf("%-19s", buffer);

which right-pad the string with spaces. So I tried

Code:
printf("%019s", buffer);

which left-pad the string with zeros. So I tried both

Code:
printf("%-019s", buffer);
printf("%0-19s", buffer);

but I still got a right-pad string with spaces.

I need a right-pad string with zeros. Smilie

Can I have that result with (s)printf() ?

Thanks in advance,
S.
Last edited by emitrax; 09-20-2010 at 07:08 AM..
# 2  
Old 09-20-2010
Code:
$ echo "buffer" | ruby -e 'puts gets.chomp.ljust(20,"0")'
buffer00000000000000

# 3  
Old 09-20-2010
Did I forget to specify that I need to do this in C(++)?
# 4  
Old 09-20-2010
nowhere in your post states C++. and most other languages support printf and sprintf functions.
# 5  
Old 09-20-2010
Quote:
Originally Posted by kurumi
nowhere in your post states C++. and most other languages support printf and sprintf functions.
You are right. I fixed the title. Thanks.
# 6  
Old 09-20-2010
The stdC library doesn't specify that. Start with this C code and C++ -ify it.

Code:
char *rpad(char *dest, const char *src, const char pad, const size_t sz)
{
   memset(dest, pad, sz);
   dest[sz]=0x0;
   memcpy(dest, src, strlen(src));
   return dest;
}

# 7  
Old 09-20-2010
Code:
printf("%s%019s\n", buffer, "0");
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