Populating a vector with a for loop.

Question

Write a for loop to populate vector userGuesses with NUM_GUESSES integers. Read integers using cin. Ex: If NUM_GUESSES is 3 and user enters 9 5 2, then userGuesses is {9, 5, 2}.

#include <iostream>

#include <vector>

using namespace std;

int main() {

const int NUM_GUESSES = 3;

vector<int> userGuesses(NUM_GUESSES);

unsigned int i;

}

for (i = 0; i < userGuesses.size(); ++i) {

cout << userGuesses.at(i) << " ";

}

return 0;

}

Answer 1

1. Compiler error: extra closing curly brace in the middle of main()
2. not prompting for input
3. declare an empty vector to start; then insert each number using iterator.end();
4. you can use the overloaded operator [] to index the array
5. 
   

Here's the code:

using namespace std;

int main()

{

const int NUM_GUESSES = 3;

vector<int> userGuesses(0);

unsigned int i;

for (i = 0; i < NUM_GUESSES; ++i)

{

int iNum;

cout << " Please input the # :>";

cin >> iNum;

vector<int>::iterator iIndexPos = userGuesses.end();

userGuesses.insert(iIndexPos,iNum);

}

int N = userGuesses.size();

for (i=0; i<N; i++)

{

cout <<userGuesses[i] << endl;

}

return 0;

}