help in filling the gaps..

i cant figure out what to write instead of ??2?? ...??5??

the function rotates to the right the letters on the odd places
"num" times
if num=3 then
abcdef>>afcbed>>adcfeb>>abcdef

i solved the first one
i need hints regarding the others??

Code:

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void rotateodd(char *str,int num){
    int len,last,i,j;
    char ch;
    len=strlen(str);
    if(len<4) return;
    num=??2??;
    if (num<0) num+=len/2;
    if (len%2)
          last=??3??;
  else
        last=??4??;
  for(i=0;i<num;i++){
      ch=str[last];
      for(j=last;j>1;??5??)
              ??6??=??7??;
        ??8??=ch;
  }
}

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See also
http://cboard.cprogramming.com/c-pro...-question.html

Quote:

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Originally Posted by transgalactic2

i can figure out what to write instead of ??2?? ...??5??

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What with the question marks, are they placeholders?

yes
instead ??2?? i need to write some thing