How will you answer the "Hello world" challenge written in C language?

In recent days, , Foreign coding platform Intervee Created a simple programming challenge （ Challenge links ：https ://platform.intervee.io/get/play_/ch/hello_[w09]orld）, Ask for answers print "Hello World", But the code cannot use letters W Or any number .

Although the challenge is for junior developers , But there are still many 2 Developers with more than years of working experience participated in and disclosed the solution .（173 Users tried to solve the problem , share 148 I didn't receive the prompt from the virtual interviewer , The challenge succeeded within the recommended time .）

among , Only 30% The solver of is elementary （0-2 Years of experience ） Developer , meanwhile 85% Those who fail to solve problems on time are also junior developers . This also means that this challenge is difficult for beginners , It sounds like a good way to check whether a candidate is junior or advanced .

Last , The platform selected several interesting results and shared them , Let's have a look ！

One 、 The most common and simplest ： Use %c specifier

remind ：ascii Medium char 87 yes W

printf("Hello %corld", ++*(char[]){"V"});

printf("Hello %corld", *"V" | *"A");

printf("Hello %corld", *"*" + *"-");

char c = c^c++; 

c=(c<<(c+c+c+c+c+c))+(c<<(c+c+c+c))+(c<<(c+c))+(c<<c)+c;
printf("Hello %corld",c);

printf("Hello %corld", EUSERS);

This is the shortest code ,EUSERS Is, indeed, 87：

https://kernel.googlesource.com/pub/scm/linux/kernel/git/nico/archive/+/v0.97/include/linux/errno.h

Two 、 Cool C++ Solution ：

char c = (sizeof(bool)+sizeof(short)) * (sizeof(long) * sizeof(float) - sizeof(char) - sizeof(short));
cout << "Hello " << c << "orld";

It is worth mentioning that , The solution is saved as multiple steps , So you can see how the solver does it , Not just his final solution . for instance （ come from ： Interway.AI interactive challenges）

3、 ... and 、 Cool Python Solution ：

from googletrans import Translator
text = 'Hola Mundo!'
translator = Translator()
print(translator.translate(text).text)

import hello
# _hellol is a known library that prints hello world. Problem solved.

Four 、C and C++ Medium “ encryption ” Method ：

char str[] = "Obkkh'Phukc\n";
char strPtr = str; while (strPtr != '\n') *strPtr++ ^= '\a';
printf("%s", str);

5、 ... and ： Same method , stay C++ in ：

std::string str = "V_xyz";
char v_x;
for(auto i:str){ v_x=i; break; }
v_x++;
std::cout<<"Hello "<<v_x<<"orld";

6、 ... and ： Cool cheating scheme ：

system("echo \"echo Hello World\" > /usr/bin/gcc");

The solver finds the challenge to use /usr/bin/gcc Situated gcc To compile the code , So replace it with “echo Hello World”, Super good ！

Last , Do you have any other unique solutions ？ Welcome to the challenge ！

Link to the original text ：10 ways to write Hello World in C - Interway.AI

---

《 New programmers 001-004》 Fully listed , Welcome to scan the QR code below or click to enter Subscribe now , You can enjoy e-books and exquisite paper books ！