Different ways to initialize variables

Question

There are different ways to initialize a variable in c++. int z(3) is same as int z=3. Is

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int z;
z(3);

same as

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int z;
z=3;

?

Answer 1

You can use:

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int z;
z = 3;

Or just:

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int z = 3;

Or:

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int z(3);

Or:

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int z = int(3);