To where does the library functions in c return the value? -

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Eventually the library function will return a value. Who takes this return value?

For example, consider the code below. 

  # include & lt; Stdio.h & gt; The main () {printf ("Waiting for the character being pressed with the keyboard to exit. \ N"); Getch (); Return 0; }   
  getch ()  gives a value Who casts this value?  
 Answer me in general knowledge, not specific to the above program.   
 
 
 The return value of a function can be removed.  
 In the example you provided, you would not know that there is actually a return value of  printf   
 the function call  Expression description , only the side effect is being followed, the return value is abandoned. Another example of the expression statement is:  
  21 + 21;   
 Expression  21 + 21  has been evaluated and omitted. C allows this syntax, even though a compiler has optimized it.

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