I am producing an infinite loop and not sure why?

[tempneff]

I just want it to run the program until its told not to, but once i hit the bottom I go into an infinite loop.
It seems that I am retaining the gcout value but I thought I eliminated it with str.clear?? I also tried str.erase to no avail

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char** argv) {

//Declare all variables

int starting_balance, checks, deposits;
char ans;

do{
string str;
cout<<" Enter 4 digit account number #";
//Restrict valid input to 4 digits
//reference: http://msdn.microsoft.com/en-us/library/3w9exa29(v=vs.80).aspx
cin.get( &str[0],6 );
if (cin.gcount( )==4){
    
        //prompt for input
        cout<<" What is your starting balance this month?"<<endl;
        cout<<" $";cin>>starting_balance;
        cout<<" What is the total of checks written from this account?"<<endl;
        cout<<" $";cin>>checks;
        cout<<" What is the total deposits into this account?"<<endl;
        cout<<" $";cin>>deposits;
        //calculate new balance and output results
        if ((starting_balance-checks+deposits)<0){
            cout<<" Looks like your down on your luck"<<endl;
            cout<<" Your balance is $"<<starting_balance-checks+deposits<<" but...."<<endl;
            cout<<" We have to charge you $20 because you were overdrawn, so now your balance is $"<<starting_balance-checks+deposits-20<<endl;
            cout<<" Dont worry...The sun will come out tomorrow, bet your bottom dollar...oops you dont have a bottom dollar"<<endl;
        }else if (starting_balance-checks+deposits==0){
            cout<<" Well there you have it your balance is $0"<<endl;
            cout<<" It's better than a stick in the eye I suppose"<<endl;
        
        }else {
            cout<<" Your new balance is $"<<starting_balance-checks+deposits<<endl;
            cout<<" Dont spend it all in one place...unless its Walmart..they have everything!"<<endl;
        }
}
//Error for input != 4
else{
    cout<<"Invalid Entry"<<endl;
}
//Clear string gcount value reference: http://www.cplusplus.com/reference/string/string/clear/

//prompt for global loop    
cout<<" Would you like to start again?"<<endl;
str.clear();
cout<<" ";cin>>ans;
}while(ans=='y'||ans=='Y');
 
//Exit the program
return 0;

[Disch]

string str;
//...
cin.get( &str[0],6 );

Don't do this. &str[0] doesn't exist (bad pointer) because str is empty. You are giving a bad pointer to cin.get and telling it that it can write 6 characters there when it isn't safe to write any.

Since you have a string, use the string version of getline:

string str;
//...
std::getline( cin, str );

[tempneff]

I see that. I had it originally without a string or str.clear();

char str[7];
\\...
cin.get( &str[0],6 );

and had the same result; an infinite loop once the program is rerun.

with

std::getline ( cin, str);

edit:: now I'm using string::size and my problems are solved

I only recieve a cin.getcount() value of 0. I wanted to know how many digits are entered.