C programming interview questions

C programming interview questions

• 2.
  Q.1: What isC language in your opinion?
• 3.
   Developed byDennis Ritchie between 1969 & 1973.  Developed at the Bell Laboratories, aimed to use with UNIX OS.  Widely used for developing application software, though it was mainly invented for developing system software.
• 4.
  Q.2: What isa static variable in context of C language?
• 5.
   Declared insidea function.  Declared for function name.  Declared for Global parameters.
• 6.
  Q.3: Can youexplain the difference between a normal variable and a pointer?
• 7.
   A normalvariable can have any value and can be changed throughout the length of the program.  A pointer defines the address where another variable is stored and not any value.
• 8.
  Q.4: What isthe difference between calloc() and malloc()?
• 9.
   malloc() willcreate single block of memory of size specified by the user.  Example - p=(int*)malloc(sizeof(int)*5)  calloc() takes two arguments and zero initializes the memory. It can assign multiple blocks of memory for a variable.  Example - p=(int*)calloc(5,sizeof(int)*5)
• 10.
  Q.5: What isthe difference between printf() and sprint()?
• 11.
   Printf() outputsthe data to the standard output device which is usually the computer monitor.  Sprint() outputs the data to a character array.
• 12.
  Q.6: Which isthe fastest sorting method you can use while programming in c language?
• 13.
  This is aquestion which falls into “There is no one-size-fits-all answer” category. But few options are-  Quick sort.  Radix sort.  Merge sort.
• 14.
  Q.7: Is usingfunctions or macros better when programming in C?
• 15.
   Macros aregenerally more efficient and faster.  Macros cannot handle complex programming constructs and in such cases functions are used  We can choose macros or functions based on our priority - speed vs. size of program.
• 16.
  Q.8: What isa Stack?
• 17.
   Stack iswhere information required to call and return function resides  It also stores a functions local variable  Stack follows a FIFO model
• 18.
  Q.9: What isthe difference between C and C++?
• 19.
   C++ isan advanced version of C which introduced a lot of new features like classes and so on.  It’s much more object oriented compared to the general purpose programming C was initially created for.
• 20.
  Q.10: Is itgood to use goto statement?
• 21.
   goto statementsare used to implement a local jump during program execution.  It is not considered a good practice to use goto statements and should be avoided as much as possible.
• 22.
  For more C++gyan, log on to- YourNextLeap.com