K & R C Programs Exercise 4-12.

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 .

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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);
i = 0;
if(n < 0)
s[i++] = '-';
s[i++] = abs(n) %10 + '0';
s[i] = '';

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