help displaying output

[wandafoda]

Hey guys.... i've never posted here before, but everytime i need some c++ help, google takes me here, so i figured i'd give it a shot....i'm posting about homework for a class.

this is a pretty newbie question.....

anyways....we had to input data from a file...unkown number of rows...manipulate the numbers....then output all the data...i wrote my program..it works perfectly, but i have to display the the results ....which are 4 numbers/words per row....and have to make em line up nicely in a column.
I tried using the setw command, but my data doesn't line up if any 1 of the numbers in 1 row has a different number of digits in another...basically...

1 2 3
5 6 7
12 34 56

that happens
is there a different command i can use???

thanks

[D_C]

Is there a specified range for each number input? In other words, do you know that no number will be more than, say, 4 digits? Assuming no negative numbers (a minus sign would require an extra space), I'll give some psuedocode

const int MAX_NUM_DIGITS = 4;
const int WORDS_PER_LINE = 4;
string output =  "";
 
For each line
{
  output = "";
  i = 0;
  While (i < WORDS_PER_LINE)
  {
    output += number;
    While(output.length < (i * (1+MAX_NUM_DIGITS))) 
    { // The extra space is so that the numbers don't run together
       output += " ";
    }
    i++;
  }
}

[Banfa]

That seems very complex D_C I went for

#include <iostream>
 
using namespace std;
 
int main(int argc, char* argv[])
{
    int a=1;
    int b=2;
    int c=3;
 
    int x=10;
    int y=11;
    int z=12;
 
    cout.width(4);
    cout << a;
    cout.width(4);
    cout << b;
    cout.width(4);
    cout << c;
    cout << endl;
 
    cout.width(4);
    cout << x;
    cout.width(4);
    cout << y;
    cout.width(4);
    cout << z;
    cout << endl;
 
    return 0;
}
 

Output

   1   2   3
  10  11  12

Which seems to work, however even this seems long winded compared to the c version which makes me wonder if there is a better way of doing it in C++

#include <iostream>
 
using namespace std;
 
int main(int argc, char* argv[])
{
    int a=1;
    int b=2;
    int c=3;
 
    int x=10;
    int y=11;
    int z=12;
 
    printf("%4d%4d%4d\n", a, b, c);
    printf("%4d%4d%4d\n", x, y, z);
    return 0;
}

Output


Output

   1   2   3
  10  11  12

[Banfa]

Oh and wandafoda if you need more help then posting the output code you are currently using will help us help you :)

[wandafoda]

D_C and Banfa...thanx....extremely helpful....none of those sorta things were in our lecture notes....and we covered about 15 chapters in 2 weeks.....really hard to find the material in the book.