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Dynamic Memory Allocation in C Interview Questions & Answers

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Dynamic Memory Allocation in C Interview Questions & Answers

C Dynamic Memory Allocation: malloc(), calloc(), free() & realloc() The exact size of array is unknown untill the compile time,i.e., time when a compiler compiles code written in a programming language into a executable form. Dynamic allocation is a pretty unique feature to C (amongst high level languages). It enables us to create data types and structures of any size and length to suit our programs need within the program.

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Is it better to use malloc() or calloc()?
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What are advantages and disadvantages of external storage class?
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What’s wrong with this code?

Char*p
*p=malloc(10);
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What is the heap?
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when should the volatile modifier be used?
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What is static memory allocation and dynamic memory allocation?
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How can you determine the size of an allocated portion of memory ?
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What is the difference between calloc() and malloc() ?
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Difference between calloc() and malloc()?
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What is the purpose of realloc( )?
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Difference between malloc and calloc?
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How can you determine the size of an allocated portion of memory?
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What’s wrong with this code?

Char*p
*p=malloc(10);
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what is the difference between the functions memmove() and memcpy()?
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Difference between calloc and malloc ?
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What is the Difference between calloc and malloc?
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Why do we need to test weather it is memory leak or not?

How are we going to know that?
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How to write calloc() in terms of malloc()? ie malloc() should initialise the memory to zero after allocating it
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when memory will be created after defining in c and c++;
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Why does malloc(0) return valid memory address ? What's the use ?
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