#include <stdio.h>
main()  /*count digits, white space, others */
{
   int c, i, nwhite, nother, ndigit[10];

   nwhite =nother = 0;
   for (i = 0; i < 10; i++)
        ndigit[i] = 0;
   while((c =getchar()) != EOF) {
       switch(c){
         case '0':case '1':case '2':case '3': case '4' :
         case '5':case '6':case '7':case '8':case '9':
             ndigit[c - '0']++;
             break;
         case ' ':
         case '\n':
         case '\t':
             nwhite++;
             break;
         default:
                nother++;
                break;
       }
   }
   printf("digits =");
   for(i = 0; i < 10; i++)
      printf(" %d", ndigit[i]);
   printf(", white space = %d, other = %d\n", nwhite, nother);
   return 0;
}

/*binsearch: find x in v[0] <= v[1] ....<= v[n -1] */
int binsearch(int x, int v[],  int n)
{
   int low, high, mid;

   low = 0;
   high = n -1;
   while (low <= high){
     mid = (low + high) / 2;
     if (x < v[mid])
          high = mid - 1;
     else if (x > v[mid])
          low = mid + 1;
     else
         return mid;   /*found match */
   }
   return -1;   /* no match */
}

/*bitcount: count 1 bits in x */
int bitcount(unsigned x)
{
  int b;

  for (b =0; x != 0; x >>= 1)
      if (x & 01)
          b++;
  return b;
}

/*getbits: get n bits from position p */
unsigned getbits(unsigned x, int p, int n)
{
   return (x >> (p + 1 - n) & ~(~0 << n);
}

/*strcat: concatenate t to end of s; s must be big enough */
void strcat(char s[], char t[])
{
   int i, j;

   i = j = 0;
   while(s[i] != '\0')            /*find end of s*/
         i++;
   while ((s[i++] = t[j++]) != '\0')   /* copy t */
           ;
}

/*squeeze: delete all c from s */
void squeeze(char s[], int c)
{
   int i, j;

   for(i = j = 0; s[i] !='\0'; i++)
       if (s[i] != c)
          s[j++] = s[i];
   s[j] = '\0';
}

unsigned long int next = 1;

/*rand: return pseudo-random integer on 0...32767 */
int rand(void)
{
   next = next * 1103515245  + 12345;
   return (unsigned int )(next/65536) % 32768;
}

/*srand; set seed for rand() */
void srand(unsigned int seed)
{
    next = seed;
}

/*lower: convert c to lower case:ASCII only */
int lower(int c)
{
  if (c >= 'A' && c <= 'Z')
      return c + 'a' - 'A';
  else
      return c;
}

int atoi(char s[])
{
   int i, n;

   n = 0;
   for(i =0; s[i] >= '0' && s[i] <= '9';++i)
       n = 10 * n + (s[i] - '0');
   return n;
}

if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
    printf("%d is a leap year\n", year);
else
    printf("%d is not a leap year\n', year);