In a small code, we can track values of global variables. But if the code size grows, they make code less understandable (hence less maintainable). It becomes difficult to track which function modified the value and how.
- In above code, we notice one of the biggest problem of global variable that is Debugging. It means if we trying to figure out where that variable c has changed between thousands of lines of code is very difficult job.
- In multihreaded environment a global variable may change more than once (in different execution orders) and cause more problems.
- Global variables are generally used for constants. Using them for non-const values is not recommended.
- Initialization of global and static variables in C
- Redeclaration of global variable in C
- How Linkers Resolve Global Symbols Defined at Multiple Places?
- Variables and Keywords in C
- Static Variables in C
- Scope of Variables in C++
- Can we access global variable if there is a local variable with same name?
- Implicit initialization of variables with 0 or 1 in C
- Operations on struct variables in C
- Templates and Static variables in C++
- Initialization of static variables in C
- How will you show memory representation of C variables?
- C Program to print environment variables
- How are variables scoped in C - Static or Dynamic?
- Initialization of variables sized arrays in C
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