9.11.1. Arrays-WE9-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-WE9-P1

Q48: What does the following code do?

int [] alpha = {10, 20, 30, 40, 50};
int [] beta = new int[alpha.length+1];
for (int i = 0; i < alpha.length; i++)
   beta[i] = alpha[i];
beta[beta.length-1] = 42;
alpha = beta;

• Inserts a new value into the first position of the array
• Inserts a new value into the middle position of the array
• Inserts a new value into the last position of the array
• deletes a value from a specific position of the array
• finds and deletes a value from the array

Q49: What does the following code do?

int target = /*  some value */ ;
int [] delta = {10, 20, 30, 40, 50, 60, 70, 80, 90};
boolean found = false;
int i, j;
for (i = 0; i < delta.length && !found; i++)
   if (delta[i] == target)
      found = true;
if (found) {
   for (j = i-1; j < delta.length-1; j++)
      delta[j] = delta[j+1];
   delta[delta.length-1] = -999;
}

• Inserts a new value into the first position of the array
• Inserts a new value into the middle position of the array
• Inserts a new value into the last position of the array
• deletes a value from a specific position of the array
• finds and deletes a value from the array

Q50: What does the following code do?

int [] alpha = {10, 20, 30, 40, 50};
int [] beta = new int[alpha.length+1];
for (int i = 0; i < alpha.length; i++)
   beta[i] = alpha[i];
beta[0] = 99;
alpha = beta;

• Inserts a new value into the first position of the array
• Inserts a new value into the middle position of the array
• Inserts a new value into the last position of the array
• deletes a value from a specific position of the array
• finds and deletes a value from the array

Q51: What does the following code do?

int pos = /* some value */;
int [] rho = {10, 20, 30, 40, 50, 60, 70, 80, 90};
for (int m = pos; m < rho.length-1; m++)
   rho[m] = rho[m+1];
rho[rho.length-1] = -999;

• Inserts a new value into the first position of the array
• Inserts a new value into the middle position of the array
• Inserts a new value into the last position of the array
• deletes a value from a specific position of the array
• finds and deletes a value from the array

Q52: What does the following code do?

int [] alpha = {10, 20, 30, 40, 50};
int [] gamma = new int[alpha.length+1];
for (int i = 0; i < alpha.length; i++)
   gamma[i] = alpha[i];
gamma[gamma.length/2] = 11;
alpha = gamma;

• Inserts a new value into the first position of the array
• Inserts a new value into the middle position of the array
• Inserts a new value into the last position of the array
• deletes a value from a specific position of the array
• finds and deletes a value from the array

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

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