int i, k, n=0, s[128], nLen [128];

for (i=0; i<128; i++) nLen[i] = 0;
FILE * sample = fopen("C:\\Documents and Settings\\User\\桌面\\sample.txt", "r");

while ((i = fgetc(sample)) != EOF)           /*计算各个英文字母出现次数(不分大小写)*/
{       
      k = (char) i;    
      if ( islower(i) != 0)  count[i - 71] += 1;
      else if ( isupper(i) != 0)   count[i - 65] += 1; 
      else k = 0;
      if (k) s[n++] = k;
      if (k==' ') { s[n-1] = 0; nLen [strlen (s)]++; n=0; }
}

for (i=0;i<128;i++)
      printf ("%d : %d", i, nLen[i]);