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#include <stdio.h>
#define MAXLEN 15
void reverse(char str[]);
char* itoa(int n, char str[]);
int
main(void)
{
int n = -147483647;
char str[MAXLEN];
printf("%d\n", n);
printf("%s\n", itoa(n, str));
return 0;
}
void
reverse(char str[])
{
char temp, *str_og;
str_og = str;
while (*str++)
;
str -= 2;
while (str_og < str) {
temp = *str_og;
*str_og++ = *str;
*str-- = temp;
}
}
char*
itoa(int n, char str[])
{
int sign;
char *str_og = str;
/* to include the most -ve int */
n = ((sign = n) < 0) ? -(n+1) : n-1;
do {
*str++ = n%10 + '0';
} while ((n /= 10) > 0);
if (sign <0)
*str++ = '-';
/* part of "to include the most -ve int" */
*str_og += 1;
*str = '\0';
reverse(str_og);
return str_og;
}
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