问此内插到后缀转换c++代码有什么问题？

EN

char inputexp[50], stacks[50], resultexp[50];  
int stacktop=-1, resulttop=-1;

void priority()
{
    '^'>'/'>'*'>'+'>'-';
}

void push(char a)    
{
    stacktop++;  
    stacks[stacktop]=a;
}

void pop()
{
    resulttop++;  
    resultexp[resulttop]=stacks[stacktop];
    --stacktop;
}

void input()     
{   
    cout<<"Enter the infix expression=";  
    scanf("%s", inputexp);
}

void operandadd (char a)
{
    resulttop++;
    resultexp[resulttop]=a; 
}

void operatorfound (char a)    
{
    if(stacktop==-1||stacks[stacktop]=='(')
    {
        push(a);
    }
    else
    {         
        if(a<stacks[stacktop])        
        {              
            while(stacks[stacktop]>a&&stacks[stacktop]!='(')               
            {       
                pop();             
            }       
            push(a);        
        }    
        else         
        {            
            push(a);        
        }       
    }   
}

void rightparenthesisfound (char a)    
{        
    while(stacks[stacktop]!='(')        
    {           
        pop();       
    }       
    --stacktop;    
}

void leftparenthesisfound (char a)   
{        
    push(a);   
}

void variablefound(char a)   
{      
    resulttop++;     
    resultexp[resulttop]=a;   
}

void result()   
{      
    cout<<"Postfix Expression:"<<endl;

    for(int i=0; i<strlen(resultexp); i++)       
    {            
        cout<<resultexp[i]<<endl;        
    }    
}

int main()    
{       
    input();        
    cout<<strlen(inputexp)<<endl;
    priority();

    for(int i=0; i<strlen(inputexp); i++)         
    {            
        if(inputexp[i]=='+'||inputexp[i]=='-'||inputexp[i]=='*'||inputexp[i]=='/'||inputexp[i]=='^')             
        {                 
            operatorfound(inputexp[i]);                 
            cout<<stacks<<endl;    
        }             
        else if(inputexp[i]=='(')
        {                 
           leftparenthesisfound(inputexp[i]);            
        }             
        else if(inputexp[i]==')')        
        {
           cout<<"RIGHT "<<"STACK:"<<stacks<<endl;    
           rightparenthesisfound(inputexp[i]);                
           cout<<"RIGHT PARENTHESIS FOUND:"<<" Stack: "<<stacks<<"\t"<<"Result:"<<resultexp;    
        }            
        else             
        {                 
            variablefound(inputexp[i]);                 
            cout<<"RESULT: "<<resultexp<<endl;             
        }         
    }

    if(stacktop!=-1)         
    {             
        while(stacktop!=-1)            
        {                
           pop();                
        }        
    }

    cout<<endl<<resultexp<<endl;       
    return 0;
}