c++ - How to make an array print zeros when there is no input in that slot -

the user inputs double , string gets stored 2 arrays. :

{                  double doc;                  string nm;                  cout << " please enter amount charged credit card " << endl;                  cin >> doc;                  cout << " please enter charge made " << endl;                  cin >> nm;                  getline(cin, nm);                  cca.docharge(nm,doc);                  break;                  } 

then double , string passed :

{     if (amount > 0)     {         (int = 9; != 0; i--)         {              last10withdraws[i] = last10withdraws[i-1];             last10charges[i] = last10charges[i-1];         }          last10withdraws[0] = amount;         last10charges[0] = name;          setbalancew(amount);       }     else     {         cout << " error. number must greater zero. " << endl;     }     return 0; } 

this seems work storing data arrays. use function display data inside of arrays :

{     cout << " account: creditcard withdraws " << " " << " account: creditcard deposits " << " " << " account: creditcard last 10 charges " << endl;     cout << "            " << last10withdraws[0] << "                       " << last10deposits[0] << "                       " << last10charges[0] << endl;     cout << "            " << last10withdraws[1] << "                       " << last10deposits[1] << "                       " << last10charges[1] << endl;     cout << "            " << last10withdraws[2] << "                       " << last10deposits[2] << "                       " << last10charges[2] << endl;     cout << "            " << last10withdraws[3] << "                       " << last10deposits[3] << "                       " << last10charges[3] << endl;     cout << "            " << last10withdraws[4] << "                       " << last10deposits[4] << "                       " << last10charges[4] << endl;     cout << "            " << last10withdraws[5] << "                       " << last10deposits[5] << "                       " << last10charges[5] << endl;     cout << "            " << last10withdraws[6] << "                       " << last10deposits[6] << "                       " << last10charges[6] << endl;     cout << "            " << last10withdraws[7] << "                       " << last10deposits[7] << "                       " << last10charges[7] << endl;     cout << "            " << last10withdraws[8] << "                       " << last10deposits[8] << "                       " << last10charges[8] << endl;     cout << "            " << last10withdraws[9] << "                       " << last10deposits[9] << "                       " << last10charges[9] << endl;     cout << endl;  } 

lets user has inputted 3 doubles deposit array. when call function display :

60 30 20 -9.25596e+061 -9.25596e+061 -9.25596e+061 -9.25596e+061 -9.25596e+061 -9.25596e+061 

how can make -9.25596e+061's 0's? have not been able find helping me. array contains strings, when called display displays nothing. why ?

initialize array as:

int last10withdraws[10] = {0}; 

now elements zero.

if user enters 3 numbers, first 3 elements non-zero (assuming non-zero allowed), , rest zero.

if last10withdraws member of class m(and you're using c++03), can use member-initializer list default-initialize initialize elements zero.

class myclass {       int last10withdraws[10];    public:       myclass() : last10withdraws()        {       //^^^^^^^^^^^^^^^^^^^ member initializer list       } }; 

hope helps.