C Language Interview Question and Answers

16. What is a macro?
  Macros are the identifiers that represent statements or expressions. To associate meaningful identifiers with constants, keywords, and statements or expressions.
 
Anjali,says Mar 27, 2014
When in a program we include certain instructions many times and if we like to provide any update to it we can use macro instruction.
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17. What is arrays?
  Array is a variable that hold multiple elements which has the same data type.
 
Soumyarup ghosh, says Apr 10, 2014
An array is a collection of homogeneous elements arranged in contiguous memory locations. The space allocated for an array is fixed , it cant be altered later, so if the memory allocated for an arry is not utilised, then it is wasted, an array declaration is datatype arrayname [size ];
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18. What is the difference between #include‹ › and #include “ ”?
 
  • #include‹ ›
    Specifically used for built in header files.
  • #include “ ”
    Specifically used for used for user defined/created n header file.
 
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19. What are the advantages of the functions?
 
  • It reduces the Complexity in a program by reducing the code.
  • Function are easily understanding and reliability and execution is faster.
  • It also reduces the Time to run a program.In other way, Its directly proportional to Complexity.
  • Its easy to find-out the errors due to the blocks made as function definition outside the main function.
 
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20. How do declare an array?
  We can declare an array by specify its data type, name and the number of elements the array holds between square brackets immediately following the array name.
syntax :
data_type array_name[size];
 
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