In the following code, identify improper code or violations of style guidelines:

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/** Valid and invalid code used for an exercise to identify proper and improper coding syntax and guidelines. * @author: Joe D. Smith * @version: 0.2 (September 14, 2019) */ public class VariablesExercise { public static void main (String[] args) {

/* Source: United States Census Bureau */ int peopleInAmerica = 325,782,231;

// USD (2017) Source: Bureau of Labor Statistics double gross_domestic_product = 19.39e12;

// (Feb 2019) Source: Bureau of Labor Statistics double unemploymentRate = 4.0%;

int gdppc = gross_domestic_product/peopleInAmerica;

System.out.println("The gross domestic product per person (in the United States of America) is " + gdppc); } }