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 /* reverse:  ïåðåâîðà÷èâàåì ñòðîêó s íà ìåñòå */

 void reverse(char s[])

 {

     int i, j;

     char c;

     for (i = 0, j = strlen(s)-1; i

         c = s[i];

         s[i] = s[j];

         s[j] = c;

     }

 }

 /* itoa:  êîíâåðòèðóåì n â ñèìâîëû â s */

 void itoa(int n, char s[])

 {

     int i, sign;

     if ((sign = n) < 0)  /* çàïèñûâàåì çíàê */

         n = -n;          /* äåëàåì n ïîëîæèòåëüíûì ÷èñëîì */

     i = 0;

     do {       /* ãåíåðèðóåì öèôðû â îáðàòíîì ïîðÿäêå */

         s[i++] = n % 10 + '0';   /* áåðåì ñëåäóþùóþ öèôðó */

     } while ((n /= 10) > 0);     /* óäàëÿåì */

     if (sign < 0)

         s[i++] = '-';

     s[i] = '\0';

     reverse(s);

 }

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