when code above been run.
Will the for loop been executed since the cnt is not initialized?

hmm... why ask? just go and try it out

i dun have a compiler right now.
could u pls try it out for me?

u cant even compile the code bcos the cnt isnot initialized yet.

Can be compiled. But result unpredictable.
A new local variable, before initialization, may be holding the value 0xCCCCCCCC. But depends on the code generated by compiler.
A global variable, before initialization, is most likely to be 0.

now only i know global variable and local variable has its difference in auto-initialization...

anyway, i think this is depends on the compiler we use, rite?

it will compile and run, the loop execute only once and then it quit.

When entering a function, there is code to adjust the stack pointer to reserve space for local variables. Uninitialized local variables have values that come from old values from the stack that already have been pop-ed. The values are unpredictable.

When using Microsoft development tools, uninitialized local variables are set to 0xCCCCCCCC.

U try on complier? likely diffrent c compiler on diffrent paltform will show diffrent result...

interesting topic

your code is incomplete.
it all depends on where u put this code

lets say if its in the main(), it depends on the return type of your main() function.
of course, cnt is not initialized and the default value of int if not initialized is 0.
the loop will not run.

even if it runs, the function return 0. means that the loop will only loop once before exiting the main(), provided that i < cnt.

if your main() returns void, expect a compile error.


i'm still learning, correct me if i'm wrong.

The person was asking if that specific code would be able to run. You need not show the entire source if all you need to know is a small portion

As some other has said, it depends on what value the variable is assigned when its declared. Its unpredictable...

a better question would be... why aren't you initialising your variables with a known value?

Whether the code will run or even compile very much depends on the compiler.

As said by someone, uninitialized variables will hold unknown values and hence even if the program runs, the result might be unpredictable. It is always a good idea to initialize the variables.

i thought compiler will auto initialize the value as 0 if use doesn't initialize it ...

means the code wont execute...

That depends on the compiler, it often holds some random value or an address number.
You can try, its quite easy



Then see what you get.

yes I did using Dev-C++ compiler