is_lvalue_reference Template in C++

valarray size() function in C++

Last Updated : 23 Oct, 2018

The size() function is defined in valarray header file. This function is used to find the size of valarray and returns the size of valarray.

Syntax:

size_t size() const;

Parameter: This function doesn’t takes any parameter.

Returns: This function returns the number of element in valarray.

Below programs illustrate the above function:

Example 1:-

// C++ program to demonstrate 
// example of size() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
int main() 
{ 
  
    // Initializing  valarray 
    valarray<int> varr = { 20, 40, 60, 80 }; 
  
    // Displaying size of valarray 
    cout << "The size of valarray is: "; 
    cout << varr.size(); 
  
    cout << endl; 
  
    return 0; 
} 

Output:

The size of valarray is: 4

Example 2:-

// C++ program to demonstrate 
// example of size() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // Initializing  valarray 
    valarray<int> 
        varr = { -20, 40, -50, 60, 80, 0, 0 }; 
  
    // Displaying size of valarray 
    cout << "The size of valarray is: "; 
    cout << varr.size(); 
  
    cout << endl; 
  
    return 0; 
} 

Output:

The size of valarray is: 7

is_lvalue_reference Template in C++

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