后缀表达式+栈的应用=四则表达式运算

#include<iostream>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#include<vector>
#include<cmath>
#include<stdlib.h>
#include<iomanip>
#include<stack>
#define  MAXLEN 100
using namespace std;
class Stack   ///手写栈
{
public:
	Stack()
	{
		top = -1;
	}
	int Pop();
	int Push(char c);
	char ReadTop();
	bool Sempty();
	int Size();
	int top;
	char s[MAXLEN];
};
int Stack::Pop()
{
	if (Stack::Sempty())return 0;
	else{
		top--;
		}
}
int Stack::Push(char c)
{
	if (top == MAXLEN - 1)return 0;
	else
	{
		top++;
		s[top] = c;
		return 1;
	}
}
char Stack::ReadTop()
{
	if (Stack::Sempty())return 0;
	return s[top];
}
bool Stack::Sempty()
{
	if (top==-1)
	return true;
	else return false;
}
int Stack::Size()
{
	return top;
}
Stack s;
void Convertinto8(int d)
{
	Stack sk;
	int ba;
	while(1)
	{
		if(d==0)break;
		ba=d%8;
		sk.Push((char)(ba+'0'));
		d=d/8;
	}
	cout<<"八进制数字为:";
	while(!sk.Sempty())
	{
	    cout<<sk.ReadTop();
	    sk.Pop();
	}
	cout<<endl;
}
void Calculate()
{
	Stack A,B;//A用来存符号 B用来存后缀表达式
	stack<int>C;///偷懒了一把，C用的是stl里的栈 计算后缀表的式的时候要用到C
	char c[100];
	cout<<"请输入表达式:"<<endl;
  	 while(cin>>c)
	 {
	 	int len=strlen(c);
		for(int i=0;i<len;i++)
		{
			if(c[i]==' '){cout<<"error"<<endl;break;}
			switch(c[i])
			{
				case '*':{if(!A.Sempty()){char k=A.ReadTop();if(k=='*'||k=='/'){
				    while(!A.Sempty())
                    {
                        char k=A.ReadTop();A.Pop();B.Push(k);
                        if(A.ReadTop()!='*'&&A.ReadTop()!='/')break;
                    }

				    }  A.Push(c[i]);
                 }
				else A.Push(c[i]);break;}
				case '/':{if(!A.Sempty()){char k=A.ReadTop();if(k=='*'||k=='/'){
				    while(!A.Sempty())
                    {
                        char k=A.ReadTop();A.Pop();B.Push(k);
                        if(A.ReadTop()!='/'&&A.ReadTop()!='*')break;
                    }

				    } A.Push(c[i]);
                 }
				else A.Push(c[i]);break;}
				case '+':{if(!A.Sempty()){char k=A.ReadTop();if(k=='/'||k=='*')
				{while(!A.Sempty()){char k=A.ReadTop();B.Push(k);A.Pop();}
				A.Push(c[i]);}else A.Push(c[i]);}
				else A.Push(c[i]);break;
				}
				case '-':{if(!A.Sempty()){char k=A.ReadTop();if(k=='/'||k=='*')
				{while(!A.Sempty()){char k=A.ReadTop();B.Push(k);A.Pop();}
                 A.Push(c[i]);}
                 else if(k=='-'){char k=A.ReadTop();A.Pop();B.Push(k);A.Push(c[i]);}else A.Push(c[i]);}
				else A.Push(c[i]);break;
				}
				case')':{while(!A.Sempty()&&A.ReadTop()!='('){char k=A.ReadTop();A.Pop();B.Push(k);}
				   A.Pop();break;
				}
				case '(':{A.Push(c[i]);break;}
				default :{B.Push(c[i]);break;}
			}
		}
	while(!A.Sempty())
	{
		char k;
		k=A.ReadTop();
		A.Pop();
		B.Push(k);
	}
	char s1[100];
	int length=B.Size();
	for(int i=length;i>=0;i--)
	{
		s1[i]=B.ReadTop();
		B.Pop();
	}
	int d1,d2;
	for(int i=0;i<=length;i++)
	{
		int d=0;
		if(s1[i]=='+'||s1[i]=='-'||s1[i]=='*'||s1[i]=='/')
		{
				d1=C.top();C.pop();
				d2=C.top();C.pop();
				switch(s1[i])
				{
					case'+':{d=d1+d2;break;}
					case'-':{d=d2-d1;break;}
					case'*':{d=d1*d2;break;}
					case'/':{d=d2/d1;break;}
				}
				C.push(d);
		}
		else C.push((int)(s1[i]-'0'));
	}
	cout<<"结果为:";cout<<C.top()<<endl;
	C.pop();
	cout<<"请输入表达式:"<<endl;
    }

}
int main()
{
	int n;
	cout<<"10进制转换成8进制,请输入10进制数字"<<endl;
	cin>>n;
	Convertinto8(n);
	Calculate();
	return 0;
}