C Language Interview Question and Answers

81. What is pointer to a pointer?
  If a pointer variable points another pointer value. Such a situation is known as a pointer to a pointer.
Example : int *p1,
**p2,
v=10;P1=&v; p2=&p1;
Here p2 is a pointer to a pointer.
 
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82. What is the difference between linker and linkage?
  Linker converts an object code into an executable code by linking together the necessary built in functions. The form and place of declaration where the variable is declared in a program determine the linkage of variable.
 
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83. What is a function?
  A large program is subdivided into a number of smaller programs or subprograms. Each subprogram specifies one or more actions to be performed for the larger program. Such sub programs are called functions.
 
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84. What is an argument?
  An argument is an entity used to pass data from the calling to a called function.
 
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85. What are built in functions?
  The functions that are predefined and supplied along with the compiler are known as built in functions. They are also known as library functions.
 
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