Question

Mobile Business Programming Exercise

1.      Which ones are valid? (Please estimate each one of the following statements)

int x y = 3;

string appName = “Girls Crush”;

float RealNumber = 3.11;

String [3] myUsers = {“Eric”, “Steve”, “Linda”};

ArrayList <String> values = ArrayList <String> ( );

int [ ] income = new int [5];

float abc = 3.22

2. Fill out the blanks

________ (a > b)

              {   sum = a+b; }

              _________

                             { sum = 0; }

3. Fill out the blanks

___________ getTotal (int a, int b)

{

              total = a + b;

              ______________ total;

}

4. Fill out the blanks

___________ method1 (String txt1, String txt2)

{

              _____________ comparison;

comparison = txt1.equalTo(txt2);

}

5. What is the final result, given that a = 1, b =2, c =3, and d =5?

a<=d || a>3 || c > d || b < d

6. What is the final result, given that a = 100, b =99, c =93, and d =101?

a<=d && c < 98 && b < d

7. What is the final result of the variable sum, given that a = 100, b =99, c =93, and d =101?

              if (a > d || b < c)

                             {

                                           sum = 100;

}

else

{

              sum = 0;

}

8. Fill out the blanks

___________ method2 (String txt1, String txt2)

{

              _____________ comparison;

comparison = txt1.equalTo(txt2);

if (comparison)

{

              ___________ “The two text messages are the same.”;

}

else

{

              ___________ “The two text messages are different.”;

}

}

Answer 1

1. The valid statements are

float RealNumber = 3.11;

int [ ] income = new int [5];

2.

if (a > b)

              {   sum = a+b; }

else

                             { sum = 0; }

3.

int getTotal (int a, int b)

{

              total = a + b;

return total;

}

4.

void method1 (String txt1, String txt2)

{

boolean comparison;

comparison = txt1.equalTo(txt2);

}

5.

True

6.

True

7.

sum =0

8.

String method2 (String txt1, String txt2)

{

boolean comparison;

comparison = txt1.equalTo(txt2);

if (comparison)

{

return “The two text messages are the same.”;

}

else

{

return “The two text messages are different.”;

}

}

Please let me know in comments if you have trouble understanding any part