'How do "arrays" work in assembly / How to allocate a block of memory in asm?

I am currently learning the basics of x86-64 assembly with MASM (and VS). When I want a block of memory thats 5 bytes big I can just do:

.data
    myVar byte 1, 2, 3, 4, 5

However how do I get a block of memory that is n bytes (or qwords) long without having to manually type n numbers in the variable definition (in this case 1, 2, 3, 4, 5)?

assemblymasm


Solution 1:[1]

Thank you @Jester, you answered my question. This works:

myVar byte 100 dup(0)

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Source: Stack Overflow

Solution Source
Solution 1 DinosaurMoritz

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