Re: C++ Primer 4/e exercise 1.19

From:

=?ISO-8859-1?Q?Erik_Wikstr=F6m?= <Erik-wikstrom@telia.com>

Newsgroups:

comp.lang.c++

Date:

Thu, 12 Jul 2007 08:30:13 GMT

Message-ID:

<pElli.3950$ZA.1849@newsb.telia.net>

On 2007-07-12 10:01, arnuld wrote:

On Jul 12, 12:44 pm, "AG" <a...@tb.fr> wrote:

for(int i=lower; i <= upper; ++i)
std::cout << i
<<" "; // space between two numbers

std:: cout << "\nThank you ;-)" << std::endl;

int number_counter=0;
for(int i=lower;i<=upper;++i)
{
    std::cout << i << " ";
    number_counter++;
    if(number_counter>9)
    {
        std::cout << "\n";
    }

}

warning : this code still does not meet the requirements (on purpose).
I let you do it.
AG.

yes, it works:

int counter = 0;
  for(int i=lower; i <= upper; ++i)
    {
      if(counter > 9)
    {
      std::cout << std::endl;
      counter =0;
    }
      std::cout << i << ' '; // inserts space between 2 numbers
      ++counter;
    }

Take some time to get familiar with the % operator for integers, it can
be used to simplify the code slightly.

this is the output:
[arnuld@arch cpp]$ g++ -ansi -pedantic -Wall -Wextra ex-1.19.cpp
[arnuld@arch cpp]$ ./a.out
Enter 2 numbers: 2 10
2 3 4 5 6 7 8 9 10
Thank you Bantu ;-)
[arnuld@arch cpp]$ 2 111
-bash: 2: command not found
[arnuld@arch cpp]$ ./a.out
Enter 2 numbers: 2 80
2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 27 28 29 30 31
32 33 34 35 36 37 38 39 40 41
42 43 44 45 46 47 48 49 50 51
52 53 54 55 56 57 58 59 60 61
62 63 64 65 66 67 68 69 70 71
72 73 74 75 76 77 78 79 80
Thank you ;-)
[arnuld@arch cpp]$

BTW, how can i make the output equally dispersed ? in C i can use "%.
2d". what in C++ ?

Take a look at ostream.width(), and ostream.fill(), beware though, the
settings reset after each output. People can say what they want but
printf() beats the shit out of C++ streams when it comes to formated
output of simple data types.

--
Erik Wikstr?m