Creating a table in c
 

I wanted to create a simple table by printing lines in between my values with a header at the top and my numbers left justified. However, when I get to a ten digit number or larger, my code seems to break and my count variable goes to zero as far as I can tell, causing a bunch of space to be printed where it doesn't need to be. I was wondering what I'm doing wrong. Thank you for any help you can offer!

#include <stdio.h>



int main ( int argc, char *argv[] ) {



  unsigned int y = 1;

  int x = 1;

  int limit = sizeof(int) * 8;

  int z, n, m, count;



  printf("|     x      |     y      | \n");



  for(z = 0; z < limit - 1; z++){



    x = x << 1;

    y = y << 1;

    m = x;

    count = 0;



    while(m > 0){

      m = m / 10;

      count++;

    }



    printf("|%d", x);



    for(n = 11; n >= count; n--)

      printf(" ");



    printf("|%u", y);



    for(n = 11; n >= count; n--)

      printf(" ");



    printf("|\n");



  return 0 ;

}

Re: Creating a table in c
 

You want to print a table with the powers of 2 and you want your integers to be signed and unsigned. You're making it to complicated I think, use \t to separate your output. Or use something like printf("|%d |%u |",x,y);

Re: Creating a table in c
 

The upper limit of an int is 2147483647(32-bit system). When x reaches the value 1073741824,

x<<1;

multiples that value by 2 which yields 2147483648 which is beyond the upper limit, hence the value goes in a circle and the number -2147483648 gets stored in x and consequently in m. since you've given

while(m>0)

count never gets incremented and stays at zero.

It would be better to stop your table when m becomes negative.