式評価問題の式ツリー

#include<iostream>
#include<cstdio>
#include<string.h>
#include<stack>
#define M 1005
#define CLR(arr,now) memset(arr,now,sizeof(arr))
using namespace std;
stack<double>shu;
typedef struct Node
{
	char ope[10];
	struct Node *lchild,*rchild;
	Node()
	{
		CLR(ope,'\0');
		lchild=rchild=NULL;
	}
}*Tire,T;
char str[M];
char pre[M],post[M];
int prelen,postlen,pos;
Tire build(int l,int r)// 
{
	if(l>r) return 0;
	if(str[l]>='0'&&str[1]<='9'||str[l]=='.')
	{
		double temp;
		int len;
		sscanf(&str[l],"%lf%n",&temp,&len);// temp len
		if(l+len-1==r)
		{
			Tire cur=new T;
			sprintf(cur->ope,"%lf",temp);
			cur->ope[len]='\0';
			cur->lchild=cur->rchild=NULL;
			return cur;
		}
	}
	int pos=0,optr1=-1,optr2=-1;
	for(int i=l;i<=r;++i)
	{
		switch(str[i])
		{
		case '(':pos++;break;
		case ')':pos--;break;
		case '+':
		case '-':if(pos==0) optr1=i;break;
		case '*':
		case '/':if(pos==0) optr2=i;break;
		}
	}
	if(optr1==-1) optr1=optr2;
	if(optr1==-1) return build(l+1,r-1);
	Tire cur=new T;
	cur->ope[0]=str[optr1];
	cur->ope[1]='\0';
	cur->lchild=build(l,optr1-1);
	cur->rchild=build(optr1+1,r);
	return cur;
	
}
void pre_order(Tire root)// 
{
	if(root!=NULL)
	{
		sprintf(&pre[prelen],"%s",root->ope);
		prelen+=strlen(root->ope);
		pre[prelen++]=' ';
		pre_order(root->lchild);
		pre_order(root->rchild);
    }
}
void post_order(Tire root)// 
{
	if(root!=NULL)
	{
		post_order(root->lchild);
		post_order(root->rchild);
		sprintf(&post[postlen],"%s",root->ope);
		postlen+=strlen(root->ope);
		post[postlen++]=' ';
	}
}
double pre_calucate()// 
{     pos++;
   if(pre[pos]==' ') pos++;
   if(pre[pos]>='0'&&pre[pos]<='9')
   {
	   double temp;
	   int len;
	   sscanf(&pre[pos],"%lf%n",&temp,&len);
	   pos+=len-1;
	   return temp;
   }
   if(pre[pos]=='+') return pre_calucate()+pre_calucate();
   if(pre[pos]=='-') return pre_calucate()-pre_calucate();
   if(pre[pos]=='/') return pre_calucate()/pre_calucate();
   if(pre[pos]=='*') return pre_calucate()*pre_calucate();
  }
double post_calucate()// 
{
	postlen=strlen(post)-1;
	for(int i=0;i<postlen;++i)
	{
		if(post[i]>='0'&&post[i]<='9')
		{
			double temp;
			int len;
			sscanf(&post[i],"%lf%n",&temp,&len);
			i+=len-1;
			shu.push(temp);
		}
		else if(post[i]==' ') continue;
		else
		{
			double a=shu.top();shu.pop();
			double b=shu.top();shu.pop();
			if(post[i]=='+') shu.push(a+b);
			if(post[i]=='-') shu.push(b-a);
			if(post[i]=='*') shu.push(b*a);
			if(post[i]=='/') shu.push(b/a);
		}
	}
	double k=shu.top();
	shu.pop();
	return k;
}
void delet(Tire root)// 
{
	if(root->lchild) delet(root->lchild);
	if(root->rchild) delet(root->rchild);
	delete root;
}
int main()
{  // freopen("1.txt","r",stdin);
   // freopen("2.txt","w",stdout);
	  int T;
	  cin>>T;
	while(T--)
	{    pos=-1;
	   CLR(pre,'\0');
	   CLR(post,'\0');
       scanf("%s",str);
		prelen=0,postlen=0;
		int n=strlen(str);
		Tire root=build(0,n-2);
		pre_order(root);
		post_order(root);
		cout<<pre<<"="<<endl;
        cout<<post<<"="<<endl;
		//printf("%.2lf
",pre_calucate());
		printf("%.2lf
",post_calucate());
        delet(root);
	}return 0;
}