K and R C, Solution to Exercise 3-6:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C program to change version of itoa that accepts three arguments instead of two(K and R C Exercise 3-4). The third argument is a minimum field width; the converted number must be paddle with blanks on the left if necessary to make it wide enough. Read more about C Programming Language .

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#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#define abs(x)  ((x) < 0 ? -(x) : (x))
void itoa(int n, char s[], int w);
void reverse(char s[]);

int main(void) {
 char buffer[20];

 printf("INT_MIN: %dn", INT_MIN);
 itoa(INT_MIN, buffer);
 printf("Buffer : %sn", buffer);

 return 0;
}
//itoa: convert to n characters in s, w characters wide.
void itoa(int n, char s[], int w)
{
 void int i, sign;
 void everse(char s[]);
 sign = n;
 i = 0;
 do{
  s[i++] = abs(n%10) + '0';
  printf("%d %% %d + '0' = %dn", n, 10, s[i-1]);
 }while((n/=10)!=0);
 if(sign < 0)
  s[i++] = '-';
 while(i < w)
  s[i++] = ' ';
 s[i] = '