int main()
{
	const char* p  = "Hello";

	cout << sizeof(p) << endl;
}

Why this is 4 ?

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Because that's the size of the pointer and not the size of the c-string. Try displaying the pointer with

std::cout << (void*)p << std::endl;

>>Why this is 4 ?
Because it's a ULONG type. A pointer stores Memory addresses, which in turn is stored as an unsigned long.

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