What is Garbage Value?

By BYJU'S Exam Prep

Updated on: November 9th, 2023

The Garbage value in the computer language C is defined as the leftover value from the previous program that is contained in the memory block allocated to the variable. To avoid this, the variable should be declared and initialized like int. x = 0. In the case of Windows, the maximum negative value that can be stored by the variable of int data type is 2^15=-32768 is a garbage value. 2^15 is taken not 2^16 because one bit is reserved for sign (+ or -).

Garbage Value in C Language

The formula of garbage value is garbage value = overflow value – reference value. A reference value is defined as the value which is greater than the overflow value neglecting the sign. It is obtained by multiplying the basic reference value by 2 until the value is greater than the overflow value neglecting the sign. The reference value has the same sign as that of the overflow value.

  • A random value located at an address in computer memory is the garbage value.
  • When a variable is created but not given a value, it is filled with the program’s remaining values.
  • If a specific value isn’t assigned to the computer’s memory, its value can be anything.
  • It is referred to be a trash value for the memory when it contains a random value.
  • The computer’s random collection of storage is used to maintain the data in its memory.
  • When a computer initializes a value unintentionally, a useless value called the “trash value” is assigned.

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