带括号多项式版四则运算

虽然程序还有一些问题，但是最重要的部分终于弄明白了，参考了一下Mr.Wint的博客http://www.cnblogs.com/duasonir/p/5269335.html#3380168，还有些差距，但是我没有放弃，最终功夫不负有心人，结果正确了。

后面的结果有些凌乱，仔细检查程序之后，感觉错误应该是s1.str()这个函数输出时候自带回车，有时间在检查一下。

~~找到了问题所在，原来是使用流的时候多赋值了一个endl，当时居然没检查出来。然后加了个小程序，使减法和除法的结果更可靠，不再为0；运行之后又检查出错误了— —！

// xiaoxue.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "iostream"
#include "string"
#include "time.h"
#include "cstdio"
#include<sstream>

using namespace std;

static int n=1;
static string str="";
static int sum=0;


void grow()
{
    ostringstream s1;
    if(n==1)
    {
        int b=rand()%100+1;
        sum = sum + b;
        s1 <<b<< endl;//原来错误在这里！！已改正~
        str = str + s1.str();
    }
    else
    {
        int a=rand()%100+1;
        int or=rand()%2;
        int c=rand()%4+1;
        if(or)// you
        {
            if(n<=4)
            {
                if(c==1)
                {
                    sum = sum + a;
                    s1 << a << endl;
                    str = "(" + str + "+" + s1.str() + ")";//这个函数输出自带回车，还没有解决。
                }
                else if(c==2)
                {
                    sum = sum - a;
                    s1 << a << endl;
                    str = "(" + str + "-" + s1.str() + ")";
                }
                else if (c==3)
                    {
                        sum = sum * a;
                        s1 << a << endl;
                        str = str + "*" + s1.str();
                    }
                    else if (c==4)
                    {
                        sum = sum / a;
                        s1 << a << endl;
                        str = str + "/" + s1.str();
                    }
            }
                else
                {
                    if(c==1)
                    {
                        sum = sum + a;
                        s1 << a << endl;
                        str = str + "+" + s1.str();
                    }
                    else if(c==2)
                    {
                        sum = sum - a;
                        s1 << a << endl;
                        str = str + "-" + s1.str();
                    }
                    else if (c==3)
                    {
                        sum = sum * a;
                        s1 << a << endl;
                        str = str + "*" + s1.str();
                    }
                    else if (c==4)
                    {
                        sum = sum / a;
                        s1 << a << endl;
                        str = str + "/" + s1.str();
                    }
                }
            }
        else //zuo
        {
            if(n<=4){
                if(c==1)
                {
                    sum = a + sum;
                    s1 << a << endl;
                    str = "(" + s1.str() + "+" + str+ ")";
                }
                else if(c==2)
                {
                    sum = a - sum;
                    s1 << a << endl;
                    str = "(" + s1.str() + "-" + str + ")";
                }
                else if (c==3)
            {
                sum = a * sum;
                s1 << a << endl;
                str = s1.str() + "*" + str;
            }
            else
            {
                if(sum==0)
                {
                    sum = rand()%100+1;
                }
                sum = a / sum;
                s1 << a << endl;
                str = s1.str() + "/" + str;
            }
            }
            else
            if(c==1)
            {
                sum = a + sum;
                s1 << a << endl;
                str = s1.str() + "+" + str;
            }
            else if(c==2)
            {
                sum = a - sum;
                s1 << a << endl;
                str = s1.str() + "-" + str;
            }
            else if (c==3)
            {
                sum = a * sum;
                s1 << a << endl;
                str = s1.str() + "*" + str;
            }
            else
            {
                if(sum==0)
                {
                    sum = rand()%100+1;
                }
                sum = a / sum;
                s1 << a << endl;
                str = s1.str() + "/" + str;
            }
        }
    }
    n++;
    if(n<6)
    {   
        grow();
    }
}

void born()
{ 
    n=1;
    str="";
    sum=0;
    ostringstream s1("");
    grow();
    cout<<str<<"="<<sum<<endl; 
}


int _tmain(int argc, _TCHAR* argv[])
{
    srand((unsigned)time(NULL));
    for(int i=0;i<30;i++)
    {
        cout<<i+1<<".";
        born();
    }
    getchar();
    return 0;
}

这个程序快把我的F10,F11按烂了，一次一次的报错感觉天昏地暗。结果带来的不光是喜悦，更多的是自信。相信自己会做的更好。

下面是最初的版本

// xiaoxue.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "iostream"
#include "string"
#include "time.h"
#include "cstdio"
#include<sstream>

using namespace std;

static int n=1;
static int j = 0;
static string str="";
static int sum=0;


void grow()
{
    ostringstream s1;
    if(n==1)
    {
        int b=rand()%100+1;
        sum = sum + b;
        s1 <<b<< endl;
        str = str + s1.str();
    }
    else
    {
        int a=rand()%100+1;
        int or=rand()%2;
        int c=rand()%4+1;
        if(or)// you
        {
            if(j<3)
            {
                if(c==1)
                {
                    sum = sum + a;
                    s1 << a << endl;
                    str = "(" + str + "+" + s1.str() + ")";
                }
                else if(c==2)
                {
                    sum = sum - a;
                    s1 << a << endl;
                    str = "(" + str + "-" + s1.str() + ")";
                }
            }
            else
            {
                if(j<3)
                {
                    if(c==1)
                    {
                        sum = sum + a;
                        s1 << a << endl;
                        str = str + "+" + s1.str();
                    }
                    else if(c==2)
                    {
                        sum = sum - a;
                        s1 << a << endl;
                        str = str + "-" + s1.str();
                    }
                }
                else
                {
                    if(c==1)
                    {
                        sum = sum + a;
                        s1 << a << endl;
                        str = str + "+" + s1.str();
                    }
                    else if(c==2)
                    {
                        sum = sum - a;
                        s1 << a << endl;
                        str = str + "-" + s1.str();
                    }
                    else if (c==3)
                    {
                        sum = sum * a;
                        s1 << a << endl;
                        str = str + "*" + s1.str();
                    }
                    else
                    {
                        sum = sum / a;
                        s1 << a << endl;
                        str = str + "/" + s1.str();
                    }
                }
            }
        }
        else //zuo
        {
            if(c==1)
            {
                sum = a + sum;
                s1 << a << endl;
                str = s1.str() + "+" + str;
            }
            else if(c==2)
            {
                sum = a - sum;
                s1 << a << endl;
                str = s1.str() + "-" + str;
            }
            else if (c==3)
            {
                sum = a * sum;
                s1 << a << endl;
                str = s1.str() + "*" + str;
            }
            else
            {
                sum = a / sum;
                s1 << a << endl;
                str = s1.str() + "/" + str;
            }
        }
    }
    n++;
    j++;
    if(n<=6)
    {   
        grow();
    }
}

void born()
{ 
    n=1;
    str="";
    grow();
    ostringstream s1("");
    cout<<str<<"="<<sum<<endl; 
}


int _tmain(int argc, _TCHAR* argv[])
{
    srand((unsigned)time(NULL));
    for(int i=0;i<30;i++)
    {
        cout<<i+1<<".";
        born();
    }
    getchar();
    return 0;
}

错误挺多的，最后都改正了。