valarray resize() function in C++

The resize() function is defined in valarray header file. This function resizes the valarray to contain n elements and assigns value to each element.

Syntax:

void resize( size_t n, T value = T() );

Parameter: This method accepts two parameters:



  • n: It reprsents the new size of valarray.
  • value: It represents the value to initialize the new elements with.

Returns: This function doesn’t returns anything.

Below programs illustrate the above function:

Example 1:-

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// C++ program to demonstrate
// example of resize() function.
  
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // Initializing  valarray
    valarray<int> varr = { 20, 40, 60, 80 };
  
    varr.resize(2, 3);
  
    // Displaying valarray after resizes
    cout << "The contents of valarray "
            "after resizes are : ";
    for (int& x : varr)
        cout << x << " ";
    cout << endl;
  
    return 0;
}

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Output:

The contents of valarray after resizes are : 3 3

Example 2:-

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// C++ program to demonstrate
// example of resize() function.
  
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // Initializing  valarray
    valarray<int> varr = { 20, 40, 60, 80 };
  
    varr.resize(12, 5);
  
    // Displaying valarray after resizes
    cout << "The contents of valarray "
            "after resizes are : ";
    for (int& x : varr)
        cout << x << " ";
    cout << endl;
  
    return 0;
}

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Output:

The contents of valarray after resizes are : 5 5 5 5 5 5 5 5 5 5 5 5


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