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array::operator[] with Example in C++ STL
C++ STL | array::operator[]: Here, we are going to learn about the operator [] of Array in C++ STL.
Submitted by IncludeHelp, on February 28, 2019
C++ STL array::operator[]
Operator [] is used to get/set the element of an array in C++ STL, it returns a reference to an element at given index.
Syntax:
array_name[index];
Parameters: index - position of an element.
Return value: It returns a reference to the element at given index.
Example:
Input or array declaration:
array<int,5> values {10, 20, 30, 40, 50};
Output:
values[0] : 10
values[1] : 20
C++ STL program to demonstrate example of array:operator[]
#include <array>
#include <iostream>
using namespace std;
int main()
{
array<int,5> values {10, 20, 30, 40, 50};
//printing elements
cout<<"element at index 0: "<<values[0]<<endl;
cout<<"element at index 1: "<<values[1]<<endl;
cout<<"element at index 2: "<<values[2]<<endl;
cout<<"element at index 3: "<<values[3]<<endl;
cout<<"element at index 4: "<<values[4]<<endl;
//changing some of the values
values[0] = 100;
values[4] = 500;
//printing all elements
cout << "All elements:"<<endl;
for (int i : values) {
cout<<i<<" ";
}
cout<<endl;
return 0;
}
Output
element at index 0: 10
element at index 1: 20
element at index 2: 30
element at index 3: 40
element at index 4: 50
All elements:
100 20 30 40 500