New Ways to Assign Values to Variables in C++17

In C++ 17, there are introduced two new ways by which a programmer can assign values to a variable or declared them. In this update, elser then the classical way of assigning values to a variable the following two ways to initialise values.

Classical method

Initially the assignment operator ‘=’ is used for assignment and declaration of a variable. assignment of a variable using = looks like,

datatype variable_name = value;

Example,

int val = 243;

New method

Uniform initialisation

In uniform initialisation of variables we do not use the ‘=’ operator. the value is enclosed inside a pair of curly braces ' {} '. Value inside the pair of curly braces is passed to the variable.

Syntax

data_type variable_name{ value};

Example

 Live Demo

#include <iostream>
using namespace std;
int main() {
   cout<<"Declaring Values using uniform initialization 
";
   int val1{ 367 };
   cout << "val1 = " <<val1<<endl;
   int val2 = { 897 };
   cout << "val2 = " << val2<<endl;
   return 0;
}

Output

Declaring Values using uniform initialization
val1 = 367
val2 = 897

Constructor initialisation

another method to assign values to a variable. in constructor initialisation of variables, we use a pair of parentheses instead of the = operator. the value of variable is enclosed inside a pair of parentheses ( ).

Syntax

data_type variable_name(values);

Example

 Live Demo

#include <iostream>
using namespace std;
int main() {
   cout<<"Declaring Values using constructor initialization 
";
   int val1( 367 );
   cout << "val1 = " <<val1<<endl;
   int val2 = ( 897 );
   cout << "val2 = " << val2<<endl;
   return 0;
}

Output

Declaring Values using constructor initialization
val1 = 367
val2 = 897