Distinguish additive + and "connecting +" in system.out.println

**imago23** · August 17th, 2014, 06:28 AM

As far as I know you have to use the + sign in your system.out.println command, if you want to connect several messages.
Example: System.out.println("The house" + "green") ;
However, do you make the compiler distinguish between the "connecting" + sign and the additive + sign? Especially if you want to use both together.
For example: System.out.println("The current value of a+c is" + a+c) ;
I am using the latest Eclipse version.

I also noticed that you cannot simply use someting like System.out.println("blub" + c-a ) ;
How can this be fixed ?

**ChristopherLowe** · August 17th, 2014, 06:52 AM

The String documentation explains how the + operator applies to Strings:

The Java language provides special support for the string concatenation operator ( + ), and for conversion of other objects to strings. String concatenation is implemented through the StringBuilder(or StringBuffer) class and its append method. String conversions are implemented through the method toString, defined by Object and inherited by all classes in Java. For additional information on string concatenation and conversion, see Gosling, Joy, and Steele, The Java Language Specification.

**GregBrannon** · August 17th, 2014, 07:16 AM

Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

If c - a is an arithmetic expression that should be evaluated before printing, then put it in parens.

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