Interview questions part1

                         Interview Questions

          

• What is the output of printf(“%d”)?

        There is nothing after %d so compiler will show in
        output window garbage value.

• Difference between “calloc(…)” and “malloc(…)”?

        calloc(…) allocates a block of memory for an array
        of elements of a certain size.
        malloc(…) allocated bytes of memory and not blocks
        of memory like calloc(…).

• Can I include other file in place of .h with #include?

        Yes! The preprocessor will include whatever the file name
        you mention, eg: #include<macros.inc>, the file
        macros.inc   will be included.

• Difference between “printf(…)” and “sprintf(…)”?

       sprintf() this method writes data to the character array.
       printf() Used to write data to the standard output device.

• How to reduce a final size of executable?

       It can be reduced using dynamic linking for libraries.

• What are the different storage classes in C?

       Automatic, static and allocated are three storage classes in C.

• Difference between Strings and character arrays?

       String will have static storage duration, character array
       will not. Unless you explicitly specify with static keyword.

• How to determine the size of an allocated portion of memory?

       Using free() method.

• Difference between static memory allocation and dynamic memory allocation?

       In case of Static memory compiler allocates the
       required   memory space for a declared variable, whereas
       in dynamic memory allocation functions malloc( ) or
       calloc( ) is used to get memory dynamically.

• What is the difference between arrays and pointers?

       Pointers(*) are used to manipulate data using the
       address, Arrays are collection of similar data types.