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control panel control panel However it is customary to put in decimal points to remind yourself and anyone else who may be unlucky enough to have to read your code, exactly what is going on.This applies to calculations that take place on the right hand side of an equal sign. The left hand side of the equals sign is a different story. In fact it's so different that programmers have given the different sides of the equals sign special names. The left-hand side is called an lvalue while the right hand side is called an rvalue.

control panel An rvalue is a calculated result and as specified above it takes on the strongest type of any number involved in the calculation. On the other hand the lvalue has a type that must be defined before it is used. That's what all those float fahr, celsius; statements are doing. Once the type of an lvalue is defined it never changes. Thus if we declare fahr to be an int, then on the left hand side of an equals sign fahr will always be an int, never a float or a double or a long.

control panel If you've been following along you may notice a problem here. What if the type on the left doesn't match the type on the right? e.g. what happens with code like the following?class FloatToInt { public static void main (String args[]) { int myInteger; myInteger = 9.7; } // main ends here} //FloatToInt ends here Two things can happen.

control panel If, as above, we're trying to move a number into a weaker type of variable, the compiler generates an error. On the other hand if we're trying to move a weaker type into a stronger type then the compiler converts it to the stronger type. For instance the following code is legal:class IntToFloat { public static void main (String args[]) { float myFloat; int myInteger; myInteger = 9; myFloat = myInteger; System.out.println(myFloat); } // main ends here} //IntToFloat ends here Exercises Have the FahrToCelsius program print a heading above the table.

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