C++ assignment

#include<iostream> using std::cout; using std::endl; #include<vector> using std::vector; void displayIntegerVector(const vector<int>& intVector) { for (int value : intVector) cout << value << " "; cout << endl; } void displayVectorOfVectors(const vector<vector<int>>& vectorVector) { int vectorCount = 1; for (vector<int> oneVector : vectorVector) { // oneVector gets a copy of each integer vector in vectorVector as the for loop iterates cout << "vector " << vectorCount << ": "; displayIntegerVector(oneVector); ++vectorCount; } } // more efficient as an entire vector is not copied each iteration void alternativeDisplayVectorOfVectors(const vector<vector<int>>& vectorVector) { int vectorCount = 1; for (vector<vector<int>>::size_type i = 0; i < vectorVector.size(); ++i) { cout << "vector " << vectorCount << ": "; displayIntegerVector(vectorVector.at(i)); ++vectorCount; } } int main() { // create a vector which holds several other vectors // each of which holds integers vector<vector<int>> vectorOfVectors { {23, 45, 56, 67, 78, 89}, // one vector of integers {12, 21, 32, 43, 54, 65, 76, 77}, // a second vector of integers {87, 98, 61, 52, 91, 82, 73}, // a third vector of integers {52, 58, 49, 41, 85, 86, 96} // a fourth vector of integers }; cout << "vectorOfVectors size: " << vectorOfVectors.size() << endl; cout.imbue(std::locale("en_US")); cout << "vectorOfVectors max size: " << vectorOfVectors.max_size() << endl; // vectorOfVectors.at(0) is a vector so // vectorOfVectors.at(0).size() will determine the number of values stored in it cout << "size of first integer vector: " << vectorOfVectors.at(0).size() << endl; cout << "max size of first integer vector: " << vectorOfVectors.at(0).max_size() << endl; cout << "\ncontents of vectorOfVectors using range-based for:\n"; displayVectorOfVectors(vectorOfVectors); cout << "\ncontents of vectorOfVectors using index:\n"; alternativeDisplayVectorOfVectors(vectorOfVectors); cout << "\ncontents of vectorOfVectors using index and nested for loops:\n"; for (vector<vector<int>>::size_type i = 0; i < vectorOfVectors.size(); ++i) { cout << "vector " << (i + 1) << ": "; for (vector<int>::size_type j = 0; j < vectorOfVectors.at(i).size(); ++j) // recall vectorOfVectors.at(i) is a vector so // vectorOfVectors.at(i).at(j) is a single value in that vector cout << vectorOfVectors.at(i).at(j) << " "; cout << endl; } return 0; }