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Tutor profile: Harshit J.

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Harshit J.
Software Developer & Tutor
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Questions

Subject: Javascript Programming

TutorMe
Question:

How does typeof operator work?

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Harshit J.
Answer:

The typeof is a unary operator that is placed before its single operand, which can be of any type. Input is a string indicating the data type of the operand. Based on operand, the typeof operator evaluates to "number", "string", or "boolean" if its operand is a number, string, or boolean value and returns true or false based on the evaluation. syntax: typeof()

Subject: Java Programming

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Question:

What is Singleton class in Java?

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Harshit J.
Answer:

Singelton class is design pattern which enables and control object creation at run time, limiting the number to one when the class is loaded. And providing the same instance again and again whenever asked. private static Class instance; Private Constructor(){ .....// initialization of instance with new keyword } public static Class getInstace(){ return instance; }

Subject: C Programming

TutorMe
Question:

How to distinguish between malloc() & calloc() memory allocation?

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Harshit J.
Answer:

Apart from syntax being different, both allocates memory from heap area/dynamic memory. The difference lies in initialization. By default, calloc fills the allocated memory with 0’s. while malloc fills with some garbage value.

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