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46. What is a loop?
  A loop is a process to do a job repeatedly with possibly different data each time. The statements executed each time constitute the loop body, and each pass is called iteration. A condition must be present to terminate the loop.
  Posted by Anil. (Dec 29, 2013)

Loop is a iteration statements.

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47. What are the types of data types and explain?
    There are five basic Data types in C. These are :
  • void : means nothing i.e. no data involvement in an action
  • char : to work with all types of characters used in computer operations
  • int : to work with an integer type of data in any computational work
  • float : to work with the real type of data or scientific numbers in the exponential form
  • double : to work with double precision of numbers when the approximation is very crucial.
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48. What is friend function?
  The function declaration should be preceded by the keyword friend.The function definitions does not use either the keyword or the scope operator ::. The functions that are declared with the keyword friend as friend function.Thus, a friend function is an ordinary function or a member of another class.
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49. What is break statement?
  When a break is encountered inside a loop, the loop is terminated and the control passes to the statement following the body of the loop.
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50. What is the use of getchar() function?
  It returns a character just entered from the standard input unit, that is, keyboard. The entered character can be either assigned to a character variable or echoed to the computer screen.
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