In Programming Language, first data should be stored in Variable. After
declaring a variable and assigning value only we can use that variable in
programme.If a variable is allocated but not assigned, it is said to have a
“garbage value” , that is, some information that was being held any random
piece of the computer’s memory.
All the values that does not have a reference are called garbage values.
Most powerful garbage collection management can be seen in Java programing
language. While coding you make lot of variables and allocate memory for
them. Once you are done with your program you have to manage dynamically
allocated memory. Like you have to free all the memory that is not required
anymore. That memory is called garbage because you can not use it anymore.
For example,
#include<stdio.h>
void main()
{
int a;
clrscr();
printf(“%d”,a);
getch();
}
Here, we just declare variable a of Integer type, but not assigning any
value to the a. Yet we trying to display value of a, so, compiler will
display garbage value.
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