[pat] 00-自测1. 打印沙漏

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
void Print ( char c , int n )
{
  for ( int i = 0 ; i < n ; i++ )
    printf("%c",c) ;
}

int main ( void )
{
  double  N ;
  int n ;
  char ch ;
  scanf("%lf%*c%c", &N , &ch ) ;

  n = (int)(sqrt((N+1)/2)-1) ;

  N = N - (2*n*n + 4*n +1 ) ;

  n = 2*n+1 ;

  for ( int i = n ; i >= 1 ; i -= 2 )
  {
    Print(' ', (n - i)/2 ) ;
    Print( ch, i ) ;
    printf("\n") ;
  }
  for ( int i = 3; i <= n ; i+= 2 )
  {
    Print (' ',(n-i)/2 ) ;
    Print ( ch , i ) ;
    printf ("\n") ;
  }

  printf("%.0lf", N ) ;
  return 0 ;
}