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C Language INTERVIEW QUESTION & ANSWERS

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56. What is the difference b/w formatted&unformatted I/O functions?
  The formatted I/O functions allow programmers to specify the type of data and the way in which it should be read in or written out. On the other hand, unformatted I/O functions do not specify the type of data and the way is should be read or written.
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57. How to declare pointer variables?
  If a variable is going to be a pointer, it must be declared as such. A pointer declaration consists of a base type, an *, and the variable name. The general form for declaring a pointer variable is data _type * var_ name;
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58. What is the difference between c &c++?
  c++ ia an object oriented programing but c is a procedure oriented programing.c is super set of c++. c can't suport inheritance,function overloading, method overloading etc. but c++ can do this.In c-programe the main function could not return a value but in the c++ the main function shuld return a value.
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59. What is the use of putchar function?
  The putchar function displays one character on the display monitor. The character to be displayed is of type char. The syntax for putchar function is as given below : putchar (ch_var);
Where ch_var is a previously declared character variable.
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60. What is the use of getchar functions?
  The getchar function accepts a single character from the keyboard. The function does not require any arguments, though a pair of empty parentheses must follow the word getchar as a syntax. It returns a single character from a standard input device (typically a keyboard ) and it can be assigned to predeclared character variable.
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