表达式中缀转后缀代码，无法输出结果，请问是哪里出了问题呢？

#include <iostream>
#define maxSize 100
using namespace std;
int getpriority(char a)
{
    if(a=='+'||a=='-')
    return 0;
    else
    return 1;
}
void infixtopostfix(char infix[],char s2[],int &top2)
{
    char s1[maxSize];
    int top1=-1;
    int i=0;
    while(infix[i]!='\0')
    {
        if('0'<=infix[i] && infix[i]<='9')
            s2[++top2]=infix[i++];
        if(infix[i]=='+' || infix[i]=='-' ||infix[i]=='*' || infix[i]=='/')
        {    
            if(top1==-1 || s1[top1]=='(' || getpriority(s1[top1])<getpriority(infix[i]))
            s1[++top1]=infix[i++];
            else
            {
                s2[top2]=s1[top1--];
                ++i;
            }
        }
        if(infix[i]==')')
        {
            while(s1[top1]!='(')
            s2[++top2]=s1[top1--];
            --top1;
            ++i;
        }
    }
    while(top1!=-1)
    s2[++top2]=s1[top1--];
}

int main()
{
    char infix[maxSize]={'(','a','+','b',')','*','c','\0'};
    char result[maxSize];
    int top2=-1;
    infixtopostfix(infix,result,top2);
    for(int i=0;i<8;++i)
    cout<<result[i]<<" ";
    return 0;
}

用递归写起来简单些。

加了跟踪打印语句，找到原因是没有处理开括号。（加了限制循环次数以便看到开始的输出。）

#include <iostream>
#define maxSize 100
using namespace std;
int getpriority(char a)
{
    if(a=='+'||a=='-')
    return 0;
    else
    return 1;
}
void infixtopostfix(char infix[],char s2[],int &top2)
{
    char s1[maxSize];
    int top1=-1;
    int i=0;
    int loop = 0;
    while(infix[i]!='\0')
    {
        if (++loop > 10)
            break;
        
        cout << "start while: infix[" << i << "] = " << infix[i] << endl;
        if('0'<=infix[i] && infix[i]<='9') {
            s2[++top2]=infix[i++];
            cout << "s2[++top2]=infix[i++]: s2[" << top2 << "] = " << infix[i-1] << endl;
        }
        cout << "To check op: infix[" << i << "] = " << infix[i] << endl;
        if(infix[i]=='+' || infix[i]=='-' ||infix[i]=='*' || infix[i]=='/')
        {    
            if(top1==-1 || s1[top1]=='(' || getpriority(s1[top1])<getpriority(infix[i])) {
                s1[++top1]=infix[i++];
                cout << "s1[++top1]=infix[i++]: s1[" << top1 << "] = " << infix[i-1] << endl;
            }
            else
            {
                s2[top2]=s1[top1--];
                ++i;
            }
        }
        cout << "To check ): infix[" << i << "] = " << infix[i] << endl;
        if(infix[i]==')')
        {
            while(s1[top1]!='('){
                s2[++top2]=s1[top1--];
                cout << "while not (: s2[" << top2 << "] = " << s1[top1+1] << endl;
            }
            --top1;
            ++i;
            cout << "if ): top1 = " << top1 << ", i = " << i << endl;
        }
    }
    cout << "last while: top1 = " << top1 << endl;
    while(top1!=-1) {
        s2[++top2]=s1[top1--];
        cout << "last while: s2[" << top2 << "] = " << s1[top1+1] << endl;
    }
}
int main()
{
    char infix[maxSize]={'(','a','+','b',')','*','c','\0'};
    char result[maxSize];
    int top2=-1;
    infixtopostfix(infix,result,top2);
    for(int i=0;i<8;++i)
    cout<<result[i]<<" ";
    return 0;
}

// Output
To check ): infix[0] = (                                                                             
start while: infix[0] = (                                                                            
To check op: infix[0] = (                                                                            
To check ): infix[0] = (                                                                             
start while: infix[0] = (                                                                            
To check op: infix[0] = (                                                                            
To check ): infix[0] = (                                                                             
start while: infix[0] = (                                                                            
To check op: infix[0] = (                                                                            
To check ): infix[0] = (                                                                             
start while: infix[0] = (                                                                            
To check op: infix[0] = (                                                                            
To check ): infix[0] = (                                                                             
start while: infix[0] = (                                                                            
To check op: infix[0] = (                                                                            
To check ): infix[0] = (                                                                             
start while: infix[0] = (                                                                            
To check op: infix[0] = (                                                                            
To check ): infix[0] = (                                                                             
start while: infix[0] = (                                                                            
To check op: infix[0] = (                                                                            
To check ): infix[0] = (                                                                             
start while: infix[0] = (                                                                            
To check op: infix[0] = (                                                                            
To check ): infix[0] = (