Range-based for loop in C++

February 17, 2023

Range-based for loop

In this section, we will learn about the concept and implementation of range-based for loop in C++. Range based for loops are used to implement for loops over a specified range. This format of for loop is considered to be a more readable format of using for loop in C++ while writing codes.

Range-based For loop

In C++ programming language, we will see the syntax of range based for loop and along with it example code for the same. Range based for loops are used to implement for loops within a specified range.

Syntax:

for( range_declaration : range_expression ) 
    loop_statement

Range Declaration :
a declaration of a named variable, whose type is the type of the element of the sequence represented by
range_expression

Range Expression :
any expression that represents a suitable sequence or a braced-init-list.

Loop statement :
any statement, typically a compound statement, which is the body of the loop.

C++ Introduction

History of C++

Structure of a C++ Program

Program to check armstrong number or not

Implementation of range based for loops in C++

Example:

The following code shows the use of range-based for loops.

Run

#include<iostream> 
#include<vector>
using namespace std; 
int main()
{
	vector v = { 0, 1, 2, 3, 4, 5 };
	for (auto i : v)
		cout << i << ' ';

	cout << '\n';
	for (int n : { 0, 1, 2, 3, 4, 5 })
		cout << n << ' ';

	cout << '\n';
	int a[] = { 0, 1, 2, 3, 4, 5 };
	for (int n : a)
		cout << n << ' ';

	cout << '\n';
	for (int n : a)
		cout << "Prime" << ' ';

	cout << '\n';
	string str = "Prep";
	for (char c : str)
		cout << c << ' ';

	cout << '\n';
}

Output:

0 1 2 3 4 5
0 1 2 3 4 5
Prime Prime Prime Prime Prime Prime
P r e p

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