9.1.1. Arrays-WE1-P1

Subgoals for Evaluating Arrays

1. Set up array from 0 to size-1

2. Evaluate data type of statements against array

3. Trace statements, updating slots as you go

   1. Remember assignment subgoals

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Arrays-WE1-P1

Q1: Assume the following declarations:

String [] alpha;
alpha = new String[4];

Evaluate these statements:

alpha[0] = "apple";
alpha[1] = "Banana";
alpha[2] = alpha[0].substring(2);
alpha[3] = alpha[alpha[1].indexOf('n')];

Give the contents of array alpha after the execution of the above statements:

alpha[0] = “”

alpha[1] = “”

alpha[2] = “”

alpha[3] = “”

Q2: Assume the following declarations:

int [] beta;
beta = new int[3];

Evaluate these statements:

beta[1] = 22;
beta[0] = beta[1] - 11;
beta[2] = beta[0] + beta[1];

Give the contents of array alpha after the execution of the above statements:

beta[0] = “”

beta[1] = “”

beta[2] = “”

Q3: Which line produces the first compiler error?

• double [] gamma = new double[5];
• gamma[0] = 14;
• gamma[1] = gamma[0];
• gamma[gamma[0]] = 42;
• gamma[5] = 22;

public class main{ public static void main(String args[]){ } }

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