Question

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Is there a difference in C++ between copy initialization and direct initialization?

I just started to learn C++.

To initialize a variable with a value, I came across

int a = 0;

and

int a(0);

This confuses me a lot. May I know which is the best way?

Answer 1

int a = 0; and int a(0); make no difference in the machine generated code. They are the same.

Following is the assembly code generated in Visual Studio

int a = 10;   // mov dword ptr [a],0Ah  
int b(10);    // mov dword ptr [b],0Ah