valarray cos() function in C++

valarray begin() function in C++

Last Updated : 24 Oct, 2018

The begin() function is defined in valarray header file. This function returns an iterator pointing to the first element in the valarray v.

Syntax:

template< class T > 
    begin( valarray<T>& v );

Parameter: This function takes a mandatory parameter v which represents the valarray object.

Returns: This function returns the iterator to the first value in the valarray.

Below programs illustrate the above function:

Example 1:-

// C++ program to demonstrate 
// example of begin() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Initializing valarray 
    valarray<int> varr = { 10, 20, 30, 40, 50 }; 
  
    cout << "valarray contains="; 
  
    for (auto i = begin(varr); i != end(varr); i++) { 
        cout << ' ' << *i; 
    } 
  
    cout << endl; 
  
    return 0; 
} 

Output:

valarray contains= 10 20 30 40 50

Example 2:-

// C++ program to demonstrate 
// example of begin() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Initializing valarray 
    valarray<int> varr = { -10, -20, -30, -40 }; 
  
    cout << "valarray contains="; 
  
    for (auto i = begin(varr); i != end(varr); i++) { 
        cout << ' ' << *i; 
    } 
  
    cout << endl; 
  
    return 0; 
} 

Output:

valarray contains= -10 -20 -30 -40

valarray cos() function in C++

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