+%7B+int+y+%3D+5%3B+//+initialize+y+to+5+int+z%3B+//+declares+z%2C+but+does+not+initialize+it+Console.WriteLine(+Original+value+of+y:+%7B0%7D+%2C+y+)%3B+Console.WriteLine(+Original+value+of+z:+uninitialized/n+)%3B+//+pass+y+and+z+by+reference+SquareRef(+ref+y+)%3B+//+must+use+keyword+ref+SquareOut(+out+z+)%3B+//+must+use+keyword+out+Console.WriteLine(+Value+of+y+after+SquareRef:+%7B0%7D+%2C+y+)%3B+Console.WriteLine(+Value+of+z+after+SquareOut:+%7B0%7D/n+%2C+z+)%3B+Square(+y+)%3B+//+pass+y+by+value+Square(+z+)%3B+//+pass+z+by+value+Console.WriteLine(+Value+of+y+after+Square:+%7B0%7D+%2C+y+)%3B+Console.WriteLine(+Value+of+z+after+Square:+%7B0%7D+%2C+z+)%3B+%7D+//+end+Main+//+uses+reference+parameter+x+to+modify+caller+s+variable+static+void+SquareRef(+ref+int+x+)+%7B+x+%3D+x+*+x%3B+//+squares+value+of+caller+s+variable+%7D+//+end+method+SquareRef+//+uses+output+parameter+x+to+assign+a+value+to+an+uninitialized+variable+static+void+SquareOut(+out+int+x+)+%7B+x+%3D+6%3B+//+assigns+a+value+to+caller+s+variable+%7D+//+end+method+SquareOut+//+parameter+x+receives+a+copy+of+the+value+passed+as+an+argument%2C+so+this+method+cannot+modify+the+caller+s+variable+static+void+Square(+int+x+)+%7B+x+%3D+x+*+x%3B+%7D+//+end+method+Square+%7D+//+end+class+ReferenceAndOutputParameters.jpg)
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