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EXC BAD ACCESS error that takes me away from my code

Johndoe1134 (5)
I'm working on constructing a classic infix to postfix converter and im getting a EXC_BAD_ACCESS error that takes me away from my main.cpp(the only place with code).

Heres the code:

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string infixToPostfix(string infix)
{ 
    stack<double> numbers;
    stack<double> tempSwitch; // used to output in the right order
    char postfixTemp[MAX]; 
    string postfix;
    char *infixArray = (char*)infix.c_str(); //converts string infix to char array
    int c = 0; //counter for postfix
    for(int i = 0; i < sizeof(infixArray)/sizeof(char); i++) //goes through entire infix Array
    {
        while (*infixArray == '_')
        {   
            infixArray++; 
        }
        
        if(isdigit(*infixArray))
           {
               numbers.push(*infixArray - 48); 
               infixArray++;
           }
        else
        {
            switch(*infixArray)
            {
              case '+': 
                    for(int i =0; i < sizeof(numbers)/sizeof(double); i++)
                    { tempSwitch.push(numbers.top());
                        numbers.pop();
                    }
                    for(int i =0; i < tempSwitch.size(); i++)
                    {
                        postfixTemp[c] = tempSwitch.top();
                        tempSwitch.pop();
                        c++; 
                    }
                    postfixTemp[c] = *infixArray;
                    c++;
                    infixArray++;
                    break;
                    
                case '-': 
                    for(int i =0; i < sizeof(numbers)/sizeof(double); i++)
                    { tempSwitch.push(numbers.top());
                        numbers.pop();
                    }
                    for(int i =0; i < tempSwitch.size(); i++)
                    {
                        postfixTemp[c] = tempSwitch.top();
                        tempSwitch.pop();
                        c++; 
                    }
                    postfixTemp[c] = *infixArray;
                    c++;
                    infixArray++;
                    break;
                    
                case '*': 
                    for(int i =0; i < sizeof(numbers)/sizeof(double); i++)
                    { tempSwitch.push(numbers.top());
                        numbers.pop();
                    }
                    for(int i =0; i < tempSwitch.size(); i++)
                    {
                        postfixTemp[c] = tempSwitch.top();
                        tempSwitch.pop();
                        c++; 
                    }
                    postfixTemp[c] = *infixArray;
                    c++;
                    infixArray++;
                    break;
                    
                case '/': 
                    for(int i =0; i < sizeof(numbers)/sizeof(double); i++)
                    { tempSwitch.push(numbers.top());
                        numbers.pop();
                    }
                    for(int i =0; i < tempSwitch.size(); i++)
                    {
                        postfixTemp[c] = tempSwitch.top();
                        tempSwitch.pop();
                        c++; 
                    }
                    postfixTemp[c] = *infixArray;
                    c++;
                    infixArray++;
                    break;
                    break;
                    
                default: 
                    printf("\nInvalid Operator");
                    return 0;
            }
             
        }
    }
    postfix = postfixTemp;
    cout << postfix;
    return postfix;
}

int main()
{
    char infix[MAX];
    printf("Enter Infix Expression (type quit or q to exit): ");
    gets(infix);
    infixToPostfix(infix);
}


Can anyone find the issue(s)? Thank you in advance!
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