关于中缀传后缀表达式问题

我初学数据结构，编了一个中缀传后缀表达式的程序，但是输出结果的时候运算符输不出来，只有数字输出。请高手帮忙指点迷津!
程序如下：
#include<iostream>
using namespace std;
typedef char SElemType;
#define STACK_INIT_SIZE 100
#define STACKINCREMENT 10
typedef struct
{
    SElemType *base;
    SElemType *top;
    int stacksize;
}SqStack;
bool InitStack(SqStack &s)
{
    s.base=(SElemType *)malloc(STACK_INIT_SIZE * sizeof(SElemType));
    if(!s.base)
        return 0;
    s.top=s.base;
    s.stacksize=STACK_INIT_SIZE;
    return 1;
}//构建一个空栈s
bool Push(SqStack &s,SElemType e)
      //进栈
{
    if(s.top-s.base>=s.stacksize)
       {
        s.top=new char;
        s.stacksize++;
    }
    *s.top++=e;
    return 1;
}//添加元素
bool Pop(SqStack &s,SElemType &e)
{
    if(s.top==s.base)
        return 0;
    e=*--s.top;
    return 1;
}//取栈顶元素并出栈
bool StackEmpty(SqStack s)
{
    if(s.base==s.top)
        return 1;
    else
        return 0;
}//判空
int youxianji(char a,SqStack s)
{
    if(s.base==s.top)
        return 1;
    else if(a=='+'||a=='-')
    {
        if(*(s.top-1)=='('||*(s.top-1)=='+'||*(s.top-1)=='-')
            return 1;
        else
            return 0;
    }
    else if(a=='*'||a=='/')
    {
        if(*(s.top-1)=='('||*(s.top-1)=='+'||*(s.top-1)=='-'||*(s.top-1)=='*'||*(s.top-1)=='/')
            return 1;
        else
            return 0;
    }
    else if(a=='(')
    {
            return 1;
    }
    else if(a==')')
    {
            return 0;
    }
    else
        return 2;
}//优先级函数
bool ExpressionConvert(char *src, char *dest,SqStack &s)
{
    int p=0;
    if( !StackEmpty (s))
    {
        cout<<"转换成逆波兰式失败 ";
        return 0;
    }
         for(int i=0;src[i]!='\0';i++)
         {
             if(src[i]!='+'&&src[i]!='-'&&src[i]!='*'&&src[i]!='/'&&src[i]!='('&&src[i]!=')')
            {
            dest[p]=src[i];
            p++;
            continue;
            }
            else if((src[i]=='+'&&src[i]=='-'&&src[i]=='*'&&src[i]=='/'&&src[i]=='('&&src[i]==')'))
            {
                if(youxianji(src[i],s)==1)
                {    
                    Push(s,src[i]);
                    continue;
                }
                if(youxianji(src[i],s)==0)
                {
                    Pop(s,dest[p]);
                    p++;
                    continue;
                }
            }
            if(src[i]=='\0')
         {
            while(!StackEmpty(s))
                Pop(s,dest[p]);
            p++;
         }
     }
        
        dest[p]='\0';
          return 1;

    return 1;
}
void main()
{
    SqStack s;
    char src[30],dest[30];
    cin>>src;
    s.base=NULL;
    InitStack(s);
    if(ExpressionConvert(src,dest,s))
    {
        for(int k=0;dest[k]!='\0';k++)
        {
            cout<<dest[k];
        }
        cout<<endl;
    }
    else
        cout<<"中缀表达式非法！"<<endl;
}