Range-based loop in C++ (similar to for-each loop)

C++ Range-based loop: Here, we are going to learn about the range-based loop in C++, which is similar to the for-each loop.
Submitted by Sanjeev, on April 20, 2019

Range-based loop in C++ (enhanced for loop)

for loop is used to execute a block of statements multiple times if the user knows exactly how many iterations are needed or required.

After the release of C++ 11, it supports an enhanced version of for loop, which is also called for-each loop or enhanced for loop. This loop works on iterable like string, array, sets, etc.

Syntax of range-based (for-each/enhanced for loop):

    for (data_type variable : iterable){
        //body of the loop;
    }

It stores each item of the collection in variable and then executes it.

Note: auto keyword can be used instead of data_type which automatically deduce the type of the element. So type error can be reduced.

C++ code to demonstrate example of range-based loop

// C++ program to demonstrate example of 
// range-based loop (for-each/ enhanced for loop)
#include <iostream>
using namespace std;

int main()
{
	int arr[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};

	cout << "\n Demonstration of for-each in C++" << endl;

	// Notice that instead of int, auto is used
	// it automatically checks for the type of
	// the variable so type error can be reduced
	// using auto keyword

	for (auto x : arr){
		cout << " " << x << endl;
	}

	return 0;
}

Output

Demonstration of for-each in C++
 1 
 2 
 3 
 4 
 5 
 6 
 7 
 8 
 9