C++ Declare Multiple Variables

C++ programming language allows programmers to declare multiple variables in a single statement without any line breaks. This is only possible for variables which belong to the same data type.

How to Declare Multiple Variables in C++?

This is executed using a comma (,) separated list of variables with different variables names, and the data types must be the same for all variables to be declared. Multiple variables declaration is supported for all data types in C++, for example, we can declare multiple strings with different names in a single statement using a comma separated list.

Syntax

The following syntax shows how to declare multiple variables with same data types in a single statement −

data_type var_a, var_b, var_;

Example

The following exemplar code shows how to declare multiple variables with same data types in a single statement −

#include <iostream>
using namespace std;

int main() {
   int y,z,x;

   x=10;
   y=20;
   z=30;

   cout<<"value of x: "<<x<<endl<<"value of y: "<<y<<endl<<"value of z: "<<z;

   return 0;
}

Output

value of x: 10
value of y: 20
value of z: 30

Initialize Multiple Variables

The variables can also be initialized with different values in the same statement of declaration, which makes it easy to declare variables of different values.

Syntax

The following syntax shows how to declare multiple variables, and initialize them with values in a single statement −

data_type var_a=[value1], var_b, var_c=[value3];

Here, var_a, var_b and var_c are variables of same data type, and [value] is the value of that variable.

Example

The following exemplar code shows how to declare multiple variables, and initialize them with values in a single statement −

#include <iostream>
using namespace std;

int main() {
   int y=10,z=20,x;
   x=10;
   cout<<"value of x: "<<x<<endl<<"value of y: "<<y<<endl<<"value of z: "<<z;

   return 0;
}

Output

value of x: 10
value of y: 10
value of z: 20

Initialize Multiple Variables with Same Value

The variables can also be initialized with the same values in a single statement using the ”=” operator multiple times in a single statement.

Syntax

The following syntax shows how to declare multiple variables and initialize all of them to a single value in a single statement −

data_type var_1, var_2, var_3;
var_1=var_2=var_3= [value]

Here, the variables var_1, var_2 and var_3 are initialized to a single value [value] in a single statement.

Example

The following exemplar code shows how to declare multiple variables and initialize all of them to a single value in a single statement −

#include <iostream>
using namespace std;

int main() {
   int y,z;
   int x=y=z=10;
   cout<<"value of x: "<<x<<endl<<"value of y: "<<y<<endl<<"value of z: "<<z;

   return 0;
}

Output

value of x: 10
value of y: 10
value of z: 10