Trying to store string into a vector array.

[VUEKID]

I need a little help to store two strings into a vector and reversing the order of each string. i.e.

123456789 needs to be 987654321
12345 needs to be     000054321

reason for that is I need to add those two numbers together.

[deceptikon]

With C++11 it's super trivial:

vector<string> v{ "123456789", "12345" };
long long result = 0;

for (auto x : v) {
    reverse(begin(x), end(x));
    result += stoll(x);
}

Of course, you do need to take into consideration whether the summed values will fit in the result. You may want to consider a big number library that allows arbitrary integer lengths.

[VUEKID]

your first line's got a error,

[VUEKID]

also, how would I store the strings entered by an user input n not predefined strings?

[VUEKID]

This is what I have, don't seem to work though.

    string num1; 
    string num2 ; 

    cout << "Enter a large number." << endl; 
    //cin >> num1; 
    std::getline (std::cin,num1);
    cout << "Enter a second large number." << endl; 
    //cin >> num2; 
    std::getline (std::cin,num2);





    const int INIT_VECTOR_SIZE = 20;
    vector <string> words(INIT_VECTOR_SIZE);
    words.push_back( num1 );
    vector <string> words2(INIT_VECTOR_SIZE);
    words.push_back( num2 ) ;

    long long result = 0;
    for (auto x : words) {
    reverse(begin(x), end(x));    result += stoll(x);
    }

[deceptikon]

your first line's got a error,

I also explicitly stated C++11, which you clearly aren't using. :rolleyes: Prior to C++11 it's not as simple, but still doable:

vector<string> v;
long result = 0;

v.push_back("123456789");
v.push_back("12345");

for (vector<string>::iterator it = v.begin(); it != v.end(); ++it) {
    string x = *it;

    reverse(x.begin(), x.end());

    stringstream ss(x);
    long temp;

    ss >> temp;
    result += temp;
}

long long was added in C++11, so now you really need to be careful not to overflow long or use a big number library to avoid overflow.

[VUEKID]

This is really what I really need to do to my inputs.

Read long integers as strings and store the digits of the number in the vector in reverse order.

[deceptikon]

Read long integers as strings and store the digits of the number in the vector in reverse order.

Then straight C++ won't be enough. The 32-bit limit on long and even 64-bit limit on long long may not be sufficient to store the final value. You need something like GMP or Boost.Multiprecision to extend that limit indefinitely.