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Tutor profile: Kevin L.

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Kevin L.
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Questions

Subject: Python Programming

TutorMe
Question:

Which of the following is a valid dictionary in Python? 1. myExample = {‘someItem’=>2, ‘otherItem’=>20} 2. myExample = {‘someItem’: 2, ‘otherItem’: 20} 3. myExample = (‘someItem’=>2, ‘otherItem’=>20) 4. myExample = (‘someItem’: 2, ‘otherItem’: 20)

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Kevin L.
Answer:

Only #2 is valid, a dictionary must be declared with curly brackets and a key followed by a colon followed by a value.

Subject: Java Programming

TutorMe
Question:

What is the output of following program and why? public static void main(String ags[]){ String a=”abc”; String b=new String(“abc”); System.out.println(a==b); System.out.println(a.equals(b));

Inactive
Kevin L.
Answer:

Answer: True, True Although a new string is created with the same characters, both variables point to the same object within the String pool so the first print statement will return True due to the addresses being compared. The second print statement compares the actual values within the strings and returns true as well.

Subject: C Programming

TutorMe
Question:

Explain the different types of memory management within the C programming language.

Inactive
Kevin L.
Answer:

Static memory allocation: space for the object is provided in the binary at compile-time; these objects have an extent (or lifetime) as long as the binary which contains them is loaded into memory. Automatic memory allocation: temporary objects can be stored on the stack, and this space is automatically freed and reusable after the block in which they are declared is exited. Dynamic memory allocation: blocks of memory of arbitrary size can be requested at run-time using library functions such as malloc from a region of memory called the heap; these blocks persist until subsequently freed for reuse by calling the library function realloc or free

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