Can we declare a variable in both the inner and the outer block of my program?Why it is called a bad practice if programatically it doesn’t create any problem..
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Can we declare a variable in both the inner and the outer block of my program?Why it is called a bad practice if programatically it doesn’t create any problem..
You can declare variables either in functions (local variables), or outside functions (global variables). You should generally minimize the scope of a variable, as this makes the code easier to understand.
For example, if you’re modifying the value of a global variable in one function, and call another function which, for unrelated reasons, also happens to modify that variable, the resulting code might do things that you’re not expecting and which someone reading your code wouldn’t expect (let alone if you were to then try parallelising that code…)