palindrome.c--

c--词法分析

int main() {
  int a[5];
  int b[4];
  int c[3];

  a[0] = 1;
  a[1] = 5;
  a[2] = 3;
  a[3] = 5;
  a[4] = 1;
  write palindrome(a, 0, 4);
  writeln;
  b[0] = 9;
  b[1] = 7;
  b[2] = 6;
  b[3] = 9;
  write palindrome(b, 0, 3);
  writeln;
  c[0] = 2;
  c[1] = 3;
  c[2] = 4;
  write palindrome(c, 0, 2);
  writeln;
}

int palindrome(int a[], int start, int end) {
   if (start >= end) 
      return 1;
   else {
      if (a[start] == a[end])
         return palindrome(a, start+1, end-1);
      else
         return 0;
   }
}