Initializing the Variable
After declaring the variable, it is time to assign a value to the variable. When you make an assignment to a variable, you update its value. Use a single equal sign to set the value for the variable name. This can be accomplished in two lines:
int age;
age = 45;or in one line, which is much more convenient.
int age = 45;This will set the value inside of age to 45.
double gpa = 3.5;Again, this sets the value in gpa to be 3.5
The value that is set goes on the right side of the equal sign.
Reassigning a Variable
After a variable is declared and initialized the first time, it may be necessary to reassign a value into that variable. If you need to reassign a value in the variable, you do not need to declare it again. Instead, you can just assign the new value to it by using the equal sign.
int age = 45;
//program does some other work but now the person is a year older
age = 46;