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C1X is a version of the C programming language standard that was published in 2011. It is an informal name for ISO/IEC 9899:2011, a standard promulgated by ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission). This version introduced several new features to the language, including multi-threading support, improved Unicode support, and new libraries for complex mathematical operations. It also included several improvements to the language's syntax and semantics to make it easier to write and understand code. C1X is backward compatible with previous versions of the C standard, meaning that code written in older versions of C can be compiled and run using a C1X compiler.

Ask the right questions secure the right C1X talent among an increasingly shrinking pool of talent.

First 20 minutes

General C1X app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in C1X application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

What are the key features of C1X?

C1X includes features like multithreading support, improved Unicode support, bounds checking interfaces, a new 'quick exit' function, and more.

How would you use the 'quick exit' function in C1X?

The 'quick exit' function can be used to terminate a program without completely cleaning the resources, which can be useful in situations where performance is a priority over cleanup.

Describe the difference between C1X and its previous versions.

C1X introduced several new features and improvements over previous versions, including multithreading support, improved Unicode support, and new library functions.

What are the benefits of multithreading support in C1X?

Multithreading support allows for concurrent execution of two or more parts of a program for maximum utilization of CPU.

How would you implement multithreading in C1X?

Multithreading in C1X can be implemented using the '_Thread_local' keyword to declare thread-local variables, and the 'thrd_create' function to create a new thread.

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What you’re looking for early on

Does the candidate demonstrate a strong understanding of C1X language features?

Has the candidate shown problem-solving skills during the interview?

Is the candidate able to communicate their thoughts and ideas clearly?

Does the candidate have experience with large-scale projects?

Next 20 minutes

Specific C1X development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

What are the new library functions introduced in C1X?

C1X introduced several new library functions, including 'aligned_alloc' for aligned memory allocation, 'quick_exit' for quick program termination, and 'thrd_create' for thread creation.

How would you use the 'aligned_alloc' function in C1X?

The 'aligned_alloc' function can be used to allocate a block of memory that is suitably aligned for any object type. The function takes two parameters: the alignment and the size of the memory to be allocated.

Describe the difference between 'exit' and 'quick_exit' in C1X.

While both functions terminate the program, 'exit' performs complete cleanup of resources, while 'quick_exit' does not, which can make it faster in certain situations.

What are the benefits of the improved Unicode support in C1X?

Improved Unicode support allows for better handling of international text, making it easier to develop software for global markets.

How would you use the improved Unicode support in C1X?

Unicode support in C1X can be used by including the 'uchar.h' header and using the 'char16_t' and 'char32_t' types for Unicode characters and strings.

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At this point, a skilled C1X engineer should demonstrate strong problem-solving abilities, proficiency in C1X programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with C1X.

What does the following simple C1X code do?
int main() {
	int a = 5;
	int b = 10;
	int c = a + b;
	printf('%d', c);
	return 0;
}
This code adds two integers, 5 and 10, and prints the result, which is 15.
What will be the output of this C1X code snippet?
int main() {
	char str[] = 'Hello, World!';
	printf('%s', str);
	return 0;
}
The output will be the string 'Hello, World!'
What does this C1X code snippet do?
int main() {
	int arr[] = {1, 2, 3, 4, 5};
	int sum = 0;
	for(int i = 0; i < 5; i++) {
		sum += arr[i];
	}
	printf('%d', sum);
	return 0;
}
This code calculates the sum of all elements in the integer array {1, 2, 3, 4, 5}, and prints the result, which is 15.
What does this C1X code snippet do?
#include 

void* printHello(void* threadid) {
	printf('Hello from thread %d', threadid);
	pthread_exit(NULL);
}

int main() {
	pthread_t threads[5];
	for(int i = 0; i < 5; i++) {
		pthread_create(&threads[i], NULL, printHello, (void*)i);
	}
	return 0;
}
This code creates 5 threads and each thread prints a message 'Hello from thread' followed by its thread id.

Wrap-up questions

Final candidate for C1X Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle C1X application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

What are the bounds checking interfaces in C1X?

Bounds checking interfaces are a set of functions that check whether the data fits into the destination before it is copied, helping to prevent buffer overflow.

How would you use the bounds checking interfaces in C1X?

Bounds checking interfaces can be used by including the 'string.h' header and using functions like 'strcpy_s' and 'strcat_s' that take an additional size parameter.

Describe the difference between 'strcpy' and 'strcpy_s' in C1X.

While both functions copy a string, 'strcpy_s' takes an additional size parameter and checks whether the data fits into the destination before it is copied, helping to prevent buffer overflow.

C1X application related

Product Perfect's C1X development capabilities

Beyond hiring for your C1X engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in C1X projects, and can engage in multiple capacities.

C1X Consultive assessments

C1X Application Conversion Assessment C1X Application Integration Assessment C1X Data & Database Integration Assessment

Custom C1X development projects

Custom C1X App Conversion C1X Custom App Development Process App UI Design for C1X Facelifts

Hiring guide for C1X Engineers

C1X Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the C1X engineer at this point.

C1X Consultive assessments

Custom C1X development projects