Created
February 15, 2020 18:04
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Vectors in C++ are more or less similar to what list is in Python.
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#include <bits/stdc++.h> | |
using namespace std; | |
int main(int argc, char *argv[]) { | |
vector<int> g1; | |
for (int i = 1; i <= 10; i++) { | |
g1.push_back(i * 10); | |
} | |
cout << "\nReference operator [g]: g1[2] = " << g1[2]; | |
cout << "\nat : g1.at(4) = " << g1.at(4); | |
cout << "\nfront() : g1.front() = " << g1.front(); | |
cout << "\nback() : g1.back() = " << g1.back(); | |
// pointer to the first element | |
int* pos = g1.data(); | |
cout << "\nThe first element is " << *pos; | |
return 0; | |
} |
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#include <iostream> | |
#include <vector> | |
using namespace std; | |
int main() { | |
vector<int> g1; | |
for (int i = 0; i <= 5; i++) { | |
g1.push_back(i); | |
} | |
cout << "Size: " << g1.size(); | |
cout << "\nCapacity: " << g1.capacity(); | |
cout << "\nMax Size: " << g1.max_size(); | |
g1.resize(4); | |
cout << "\nSize: " << g1.size(); | |
if (g1.empty() == false) | |
cout << "\nVector is not empty"; | |
else | |
cout << "\nVector is empty"; | |
g1.shrink_to_fit(); | |
cout << "\nVector elements are: "; | |
for (auto it = g1.begin(); it != g1.end(); it++) | |
cout << *it << " "; | |
return 0; | |
} |
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#include <iostream> | |
#include <vector> | |
using namespace std; | |
int main() | |
{ | |
vector<int> g1; | |
for (int i = 1; i <= 5; i++) | |
g1.push_back(i); | |
cout << "Output of begin and end: "; | |
for (auto i = g1.begin(); i != g1.end(); ++i) | |
cout << *i << " "; | |
cout << "\nOutput of cbegin and cend: "; | |
for (auto i = g1.cbegin(); i != g1.cend(); ++i) | |
cout << *i << " "; | |
cout << "\nOutput of rbegin and rend: "; | |
for (auto ir = g1.rbegin(); ir != g1.rend(); ++ir) | |
cout << *ir << " "; | |
cout << "\nOutput of crbegin and crend : "; | |
for (auto ir = g1.crbegin(); ir != g1.crend(); ++ir) | |
cout << *ir << " "; | |
return 0; | |
} |
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// C++ program to illustrate the modifiers in vector | |
#include <bits/stdc++.h> | |
#include <vector> | |
using namespace std; | |
int main() | |
{ | |
// assign vector | |
vector<int> v; | |
// fill the array with 10 five times | |
v.assign(5, 10); | |
cout << "The vector elements are: "; | |
for (int i = 0; i < v.size(); i++) | |
cout << v[i] << " "; | |
// inserts 15 to the last position | |
v.push_back(15); | |
int n = v.size(); | |
cout << "\nThe last element is : " << v[n - 1]; | |
// removes last element | |
v.pop_back(); | |
// prints the vector | |
cout << "\nThe vector elements are: "; | |
for (int i = 0; i < v.size(); i++) | |
cout << v[i] << " "; | |
// inserts 5 at the beginning | |
v.insert(v.begin(), 5); | |
cout << "\nThe first element is: " << v[0]; | |
// removes the first element | |
v.erase(v.begin()); | |
cout << "\nThe first element is: " << v[0]; | |
// inserts at the beginning | |
v.emplace(v.begin(), 5); | |
cout << "\nThe first element is: " << v[0]; | |
// Inserts 20 at the end | |
v.emplace_back(20); | |
n = v.size(); | |
cout << "\nThe last element is: " << v[n - 1]; | |
// erases the vector | |
v.clear(); | |
cout << "\nVector size after erase(): " << v.size() << endl; | |
// two vector to perform swap | |
vector<int> v1, v2; | |
v1.push_back(1); | |
v1.push_back(2); | |
v2.push_back(3); | |
v2.push_back(4); | |
cout << "\nVector 1: "; | |
for (int i = 0; i < v1.size(); i++) | |
cout << v1[i] << " "; | |
cout << "\nVector 2: "; | |
for (int i = 0; i < v2.size(); i++) { | |
cout << v2[i] << " "; | |
} | |
// swaps v1 and v2 | |
v2.swap(v1); | |
cout << "\nAfter Swap \nVector 1: "; | |
for (int i = 0; i < v1.size(); i++) { | |
cout << v1[i] << " "; | |
} | |
cout << "\nVector 2: "; | |
for (int i = 0; i < v2.size(); i++) { | |
cout << v2[i] << " "; | |
} | |
return 0; | |
} |
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