C++ std::vector 总结笔记

Initialization

#include<iostream>

#include<vector>

using namespace std;

int main()

{

	vector<int> ivec(10, -1);

	vector<int> ivec2(ivec);

	for (auto x : ivec2) {cout << x << endl;}

	vector<int> jvec(10); //initialized as 0s;

    for (auto x: jvec)

    	cout << x << endl;

    vector<int> zvec{1,2,3};

    vector<int> avec={1,2,3}; //zvec and avec are equivalent

    for (int i=0; i<zvec.size(); i++)

    {

    	std::cout << (zvec[i] == avec[i]) << endl;

    }

	return 0;

}

Methods

v.empty(): return true if v is empty
v.size: return the number of elements in v
v.push_back(t): add an element to v.
v1==v2: return true if number and values are equal

int main()

{

	vector<int> avec{1,2,3};

	vector<int> bvec{1,2,3};

	cout << (avec==bvec) << endl;

	cout << (&avec==&bvec) << endl;

	return 0;

}

1

0

[Finished in 0.9s]

Iterator

int main()

{

	string s("hello");

	if (s.begin()!=s.end())

	{

		auto it = s.begin();

		*it = toupper(*it);

	}

	cout << s << endl;

	for (auto it = s.begin(); it !=s.end() && !isspace(*it); ++it)

	{

		*it = toupper(*it);

	}

	cout << s << endl;

	return 0;

}

Hello

HELLO

[Finished in 0.8s]

vector<int>::iterator it

vector<int>::const_iterator it2: it2 can read but not write

巴特西

C++ std::vector 总结笔记

Initialization

Methods

Iterator

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