Transform the expression [SIGSEGV] ERROR

On submitting my code,i am getting [SIGSEGV] error.I am not able to find the cause of this error my code is given below

#include<iostream>
#include<stack>
#include<string.h>
#include<string>




using namespace std;


int main()
{
    int T=0;
    char str[600];
    string out;
    stack<char> rStack;
    scanf("%d",&T);
    while(T--)
    {
        out= "";
    int j=1;
        scanf("%s",str);
        int slen = strlen(str);
        for(int i=0;i<slen;i++)
        {

            switch (str[i])
            {
            case '(':
                rStack.push(str[i]);
                break;
            case '+':
                {    if(!rStack.empty())
                    check : if(rStack.top()=='-' || rStack.top()=='*' || rStack.top()=='/' || rStack.top()=='^')

                        {
                            out += rStack.top();

                             rStack.pop();
                             goto check;
                        }//end if
                            rStack.push('+');
                            //cout<<"rstacki "<<rStack.top();
                            break;
                }//case +

            case '-':
                {
                    if(!rStack.empty())
                    check1 : if(rStack.top()='+' || rStack.top()=='*' || rStack.top()=='/' || rStack.top()=='^')

                        {
                            out += rStack.top();

                             rStack.pop();
                             goto check1;
                        }//end if
                            rStack.push('-');
                            break;
                }//case -
            case '*':
                {
                    if(!rStack.empty())
                    check2 : if(rStack.top()=='/' || rStack.top()=='^')

                        {
                            out += rStack.top();

                             rStack.pop();
                             goto check2;
                        }//end if
                            rStack.push('*');
                            break;
                }//case *

            case '/':
                {
                    if(!rStack.empty())
                    check3 : if( rStack.top()=='*' || rStack.top()=='^')

                        {
                            out += rStack.top();

                             rStack.pop();
                             goto check3;
                        }//end if
                            rStack.push('/');
                            break;
                }//case /

            case '^':
                {
                    rStack.push('^');
                    break;
                }//case ^

            case ')':
                {
                    if(!rStack.empty())
                    while(rStack.top()!='(')
                    {
                                    if(!rStack.empty()){
                            out+=rStack.top();
                            rStack.pop();}
                    }




                //  cout<<"r ( top  "<<rStack.top()<<" i is \n"<<j;

                    if(!rStack.empty())
                        rStack.pop();
                    break;
                }//case )
            default:
                out += str[i];
                break;
            }//end switch

        }//end for
    //  cout<<rStack.empty();
        while(!rStack.empty())
        {
            out +=rStack.top();
            rStack.pop();
        }

        cout<<out<<endl;
    }//end while
    //system("pause");

    return 0;
}