13. Communication between functions

• Functions can have input parameters:

  
      int max_value( int x, int y )
      {
          if ( x > y ) {
              return x;
          }
          return y;
      }
  
  

• The return statement is the mechanism for returning a value:

  
      return expression;
  
  

• Type of the returned value has to agree with the function prototype

• The calling function is free to ignore the returned value