valarray resize() function in C++

Last Updated : 11 Jul, 2025

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 represents 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:-

CPP

// 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;
}

Output:

The contents of valarray after resizes are : 3 3

Example 2:-

CPP

// 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;
}

Output:

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

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