UVa 10137 The Trip

UVa 10137 The Trip

通过这道题目学会了如何截去浮点数的部分小数位，可以通过如下代码实现：

sprintf(tmp, " %.mlf " ,n);
sscanf(tmp, " %lf " , & n);

其中tmp为一个字符数组，n为一个浮点数，m为要保留的小数位。
以下是我的代码：

#include < stdio.h >
int  main()
{
     /*
    freopen("data.in","r",stdin);
    freopen("data.out","w",stdout);
    // */
     const   long  maxn = 1007 ;
     long  n;
     while (scanf( " %ld " , & n) == 1 )
    {
        if (n == 0 )  break ;
        double  a[maxn],ave = 0 ,ans1 = 0 ,ans2 = 0 ;
        char  tmp[maxn];
        for ( long  i = 1 ;i <= n;i ++ )
       {
          scanf( " %lf " , & a[i]);
          ave += a[i];
       }
       ave /= n;
       sprintf(tmp, " %.2lf " ,ave);
       sscanf(tmp, " %lf " , & ave);
        for ( long  i = 1 ;i <= n;i ++ )
          if (a[i] < ave)
           ans1 += (ave - a[i]);
          else  ans2 += (a[i] - ave);
        if (ans1 < ans2) printf( " $%.2lf\n " ,ans1);
        else  printf( " $%.2lf\n " ,ans2);
    }
return   0 ;
}