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POJava error message "Cannot be resolved to a variable"?
 

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  1. POJava error message "Cannot be resolved to a variable"?
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    <p>ok so I'm kinda new to java and I'm trying to make a class which will be able to ask the user to input a 12 digit long upc code, check to make sure its a valid code, and then display if it is or not. I've got quite a few errors with the current program that I have and I can't seem to figure it out. This is the code that I have so far: </p> <pre><code>public class Upc { private long upc; public Upc(long upcs) { upc = upcs; } public long getUpc() { int m = (n2 + n4 + n6 + n8 + n10); long n = (n1 + n3 + n5 + n7 + n9 + n11); long r = (10 - (m + 3 * n) % 10); long n12 = (int) (upc % 10); upc /= 10; long n11 = (int) (upc % 10); upc /= 10; long n10 = (int) (upc % 10); upc /= 10; long n9 = (int) (upc % 10); upc /= 10; long n8 = (int) (upc % 10); upc /= 10; long n7 = (int) (upc % 10); upc /= 10; long n6 = (int) (upc % 10); upc /= 10; long n5 = (int) (upc % 10); upc /= 10; long n4 = (int) (upc % 10); upc /= 10; long n3 = (int) (upc % 10); upc /= 10; long n2 = (int) (upc % 10); upc /= 10; long n1 = (int) (upc % 10); if (r == n12) { return (upc + " is a feasible UPC code"); } else { return (upc + " is an invalid UPC code"); } } } </code></pre> <p>and my errors are as follows:</p> <pre><code>13 errors found: File: C:\Users\Andrew\Downloads\Upc.java [line: 10] Error: n2 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 10] Error: n4 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 10] Error: n6 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 10] Error: n8 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 10] Error: n10 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 11] Error: n1 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 11] Error: n3 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 11] Error: n5 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 11] Error: n7 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 11] Error: n9 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 11] Error: n11 cannot be resolved to a variable File: C:\Users\Andrew\Downloads\Upc.java [line: 39] Error: Type mismatch: cannot convert from java.lang.String to long File: C:\Users\Andrew\Downloads\Upc.java [line: 42] Error: Type mismatch: cannot convert from java.lang.String to long </code></pre> <p>I feel like fixing one or two things will eliminate alot of this, can anyone help me?</p>
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    1. COIf I might make a suggestion to someone starting out in Java... If you aren't already, try developing with a proper IDE (I'd recommend [Eclipse](www.eclipse.org) but there are other good free options). This will help with all sorts of things, from giving suggestions for fixing errors to automatically formatting code to automatically compiling, etc. I would also recommend naming your variables/methods/classes meaningfully (ok, kind of hard when they're mathematical, but still) and learning to refactor repetitious code where possible (once and only once rule). Good luck and keep at it! :-)
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      1. USAmos M. Carpenter
 

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