Variables in C++
Variables:
-
Variables are named locations in memory that are used to hold a value that may be modified by the program.
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A variable may take different values at different times during execution.
Syntax for variable declaration :
DataType IdentifierName;e.g. int a = 20;Declaring, Initializing, and Assigning Variables:
| int number; | //this is called declaration |
| We can also declare and assign some content to a variable at the same time, is called initialization. | |
| int number = 20; | //this is called initialization |
| After declaring variables, you can assign a value to a variable later on using a statement like this: | |
| num = 30; | //this is called assignment |
| We can also assign a variable the value of another variable, like so: | |
| num = num1; | |
Example :
#include<iostream>
int main() //main function
{
int x, y; //declaration
int z = 90; //initialization
x = z; //assignment
cout<<"Hello World!!\n";
return 0;
}
Next topic is variable-scope
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