The C language is used to process uninitialized data.

When a basic variable is declared, the system automatically writes a easily identifiable junk data in the memory as the initial data.

So,
An uninitialized int is displayed as a large negative number:-858993460.
A non-initialized char is displayed "? ", Int value is-52.
Two uninitialized strings are displayed as "hot"
An uninitialized int array, all assigned as-858993460.
An uninitialized char array is assigned the following values :"? ". The two question marks are added together. They are "hot"

 

Therefore, as long as you see the above values, you must have forgotten the initialization.