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I'd like to recommend the web book The Boost C++ Libraries .It is a very beginner friendly tutorial-style book showing some of the most usefull boost libraries.

Also take a look at More C++ Idioms...

Of course it does. You are exiting the while far too early.It's the way you put the { }



while (number != -999)
{
scanf ("%lf", &number);
if (number !=...

Only that he needs to examine each digit individually ;)

Or better do this


int i;
int k, num = 1; //
//initialize i;etc
if (i<0) i = -i;
while (i > 10)
{
k = i%10;// currently last digit