C++ Vector resize() function

by Online Tutorials Library July 22, 2022

C++ Vector resize()

It modifies the size of the vector to the specified value

cpp Vector resize()

Size changed to 4 and new value is

Syntax

Consider a vector v. Syntax would be:

Parameter

n : It is the new vector size.

val : If n is greater than the current vector size, then value(val) is inserted in the added space.

Return value

It does not return any value.

Example 1

Let’s see a simple example when n is less than the current vector size.

  #include<iostream>  #include<vector>  using namespace std;  int main()  {  vector<int> v;  for(int i=1;i<=10;i++)  {  v.push_back(i);  }  cout<<“Initial elements are :”;  for(int i=0;i<v.size();i++)  cout<<v[i]<<” “;  v.resize(5);  cout<<‘n’;  cout<<“After resizing its size to 5,elements are :”;  for(int i=0;i<v.size();i++)  cout<<v[i]<<” “;  return 0;  }  

Output:

     Initial elements are: 1 2 3 4 5 6 7 8 9 10   After resizing its size to 5, elementsare: 1 2 3 4 5

Example 2

Let’s see a simple example n is greater than the current vector size.

  #include<iostream>  #include<vector>  using namespace std;  int main()  {  vector<string>  v1{“java”,”C”,”C++”};  cout<<“Elements of v1 are :”;  for(int i=0;i<v1.size();i++)  cout<<v1[i]<<” “;  v1.resize(5,”.Net”);  for(int i=0;i<v1.size();i++)  cout<<v1[i]<<” “;  return 0;  }  

Output:

Elements of v1 are :java C C++ java C C++ .Net .Net

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