K and R C, Solution to Exercise 4-12:
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.
Write a C program to convert an integer into a string by calling a recursive routine.Recursive routine is the programming technique that a routine invoking itself again and again. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<math.h>
void itoa(int n, char s[]);
int main(void) {
 char buffer[20];

 //for testing!
 printf("INT_MIN: %dn", INT_MIN);
 itoa(INT_MIN, buffer);
 printf("Buffer : %sn", buffer);

 return 0;
}
/* itoa: convert n to characters in s; recursive */
void itoa(int n, char s[])
{
 static int i;
 if(n / 10)
  itoa(n /10, s);
 else{
  i = 0;
  if(n < 0)
   s[i++] = '-';
 }
 s[i++] = abs(n) %10 + '0';
 s[i] = '