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

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

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

printf("%019s", buffer);

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

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,

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

# 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
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.

char *rpad(char *dest, const char *src, const char pad, const size_t sz)
   memset(dest, pad, sz);
   memcpy(dest, src, strlen(src));
   return dest;

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

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