push_back初始化法初始值初始空间法初始值法拷贝其它Vector迭代器拷贝其它Vector

资料来源: https://www.geeksforgeeks.org/initialize-a-vector-in-cpp-different-ways/

push_back初始化法// CPP program to create an empty vector // and push values one by one. #include using namespace std; int main() { // Create an empty vector vector vect; vect.push_back(10); vect.push_back(20); vect.push_back(30); for (int x : vect) cout << x << " "; return 0; }

初始值初始空间法// CPP program to create an empty vector // and push values one by one. #include using namespace std; int main() { int n = 3; // Create a vector of size n with // all values as 10. vector vect(n, 10); for (int x : vect) cout << x << " "; return 0; }

初始值法// CPP program to initialize a vector like // an array. #include using namespace std; int main() { vector vect{ 10, 20, 30 }; for (int x : vect) cout << x << " "; return 0; }

拷贝其它Vector// CPP program to initialize a vector from

// an array.

#include

using namespace std;

int main()

{

int arr[] = { 10, 20, 30 };

int n = sizeof(arr) / sizeof(arr[0]);

vector vect(arr, arr + n);

for (int x : vect)

cout << x << " ";

return 0;

}

迭代器拷贝其它Vector// CPP program to initialize a vector from

// another vector.

#include

using namespace std;

int main()

{

vector vect1{ 10, 20, 30 };

vector vect2(vect1.begin(), vect1.end());

for (int x : vect2)

cout << x << " ";

return 0;

}