This Pgm is producing correct output but solution is not accepted????????????????????????????????????????????
#include <iostream>
#include <sstream>
#include <cmath>
#include <iomanip>
#include <stdlib.h>
using namespace std;
double return_double(string ch)
{
istringstream istr(ch);
double i;
istr >> i;
return sqrt((double)i);
}
string word(string line3,int &len)
{
string temp;
while((len>0)&&(!isalnum(line3[len])))len--;
while((len>0)&&(isalnum(line3[len])))
temp = line3[len--] + temp;
return temp;
}
int main()
{    string line1,line2,temp;

     int i,num=0;
     int len=0;

while (getline(cin,line1))
{
  line2 =  line2+' '+line1;
}
len=line2.length();

while(len>0)
{
    temp = word(line2, len);
    cout<<setprecision(4)<<fixed<<return_double(temp)<<endl;

}


return 0;
}

have u considered if last charectors are saved or not...

say
55 0 11<newline>
44 444<newline>
4454<end of file 'Ctrl-Z' without newline>

in this scenario last chars are not captured by your program... probably:)