K & R C Programs Exercise 3-6.

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;
s[i++] = abs(n%10) + '0';
printf("%d %% %d + '0' = %dn", n, 10, s[i-1]);
if(sign < 0)
s[i++] = '-';
while(i < w)
s[i++] = ' ';
s[i] = '';
void reverse(char s[]) {
int c, i, j;
for ( i = 0, j = strlen(s)-1; i < j; i++, j--) {
c = s[i];
s[i] = s[j];
s[j] = c;
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