larytet / fizz_buzz

Usage.

This should work in a Linux environment

g++ main.cpp -o fizz_buzz
# Should print 7
./fizz_buzz 5 || echo $?
# Should print 5
./fizz_buzz 7 || echo $?

Questions.

• Write a few different implementations of the function fizz_buzz() in the main.cpp.
• Can you avoid using if..else in the code?
• Could you write 5 different implementations of the code? May be 7 implementations?
• What is the performnace of the best implementation?
• What is the performnace of the worst implementation?
• https://godbolt.org/ ?

Bonus questions.

• What implementations could be salvaged and how if the logic changes to

static int fizz_buzz(int value)
{
    if (value == 7)
        return 5;
    if (value == 5)
        return 7;
    return 0;
}

• Explain this

fizz_buzz:
        push    rbp
        mov     rbp, rsp
        mov     DWORD PTR [rbp-4], edi
        cmp     DWORD PTR [rbp-4], 7
        jne     .L2
        mov     eax, 5
        jmp     .L3
.L2:
        mov     eax, 7
.L3:
        pop     rbp
        ret

• Write a simple implementation of an asycnhronous call to fizz_buzz(). Use of STL is Ok.

Java

What does this call do

FileMapping = CreateFileMapping(File, NULL, PAGE_READWRITE, 0, 0, NULL);

Windows

What is IMAGE_FILE_HEADER ?

CSharp

What does this code do

CollectionsMarshall.AsSpan() ?