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What int does in for loop? It declares a variable or other thing ?(sorry for my bad english)
for (int x = 1; x < 10; x++) { // some code }
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Here int x=1 declares variable x and initializes it with value which is 1.
And not only in for loop but anywhere else also, in your code whenever you write int/char/float/double or any other datatype and then some variable name, then you are declaring a variable.