Java

TOPIC 07 – ARITHMETIC EXPRESSIONS
AP EXTRA

AP LESSON WORK

QUESTION 1 – FOCUS ON ++ OPERATOR

What will be outputted by each of the following programs?

You are strongly recommended to paste these programs into Eclipse and test them to see if you are correct. But be sure to right down your answers first to see how well you understand.

a)

int a = 9;

System.out.println(a++);

System.out.println(a);

b)

int a = 5;

int b = 2 + a--;

System.out.println(b + " " + a);

c)

int a = 1;

int b = a++;

int c = b++;

int d = c++;

int e = d++;

System.out.println(a + b + c + d + e);

d)

double a = 100;

a--;

System.out.println(a/100);

e)

double num = 3;

double den = num-- + 1;

double ans = num / den++;

System.out.println(ans++);

QUESTION 2 – FOCUS ON += OPERATOR

What will be outputted by each of the following programs?

You are strongly recommended to paste these programs into Eclipse and test them to see if you are correct. But be sure to right down your answers first to see how well you understand.

a)

int coco = 10;

coco += 5;

System.out.println(coco);

b)

int coco = 10;

coco *= 2;

coco -= 1;

System.out.println(coco);

c)

int zerg = 10;

zerg /= 2;

zerg %= 2;

System.out.println(zerg);

d)

int num1 = 5;

int num2 = 3;

num1 += num2;

System.out.println(num1);

e)

int num1 = 5;

int num2 = 3;

int num3 = 2;

num1 *= num2 + num3;

System.out.println(num1);

QUESTION 3

What will be outputted by each of the following programs? Note that these programs contain statements that are not good form as they are over the top difficult to follow.

You are strongly recommended to paste these programs into Eclipse and test them to see if you are correct. But be sure to right down your answers first to see how well you understand.

a)

int a = 2;

int b = 3;

int c = a++ + b--;

int d = a + b + c;

System.out.println(d);

b)

int a = 2;

int b = 3;

a += b++;

b *= b++;

System.out.println(b);

c)

int x = 0;

int y = 1;

x += y--;

y += x++;

System.out.println(x + y);

d)

int x = 1;

int y = 1;

int z = 1;

z++;

y += z;

z *= x++;

x = x-1;

System.out.println("" + x + y + z);

e)

int x = 1;

int y = 2;

int z = 3;

z /= y;

x += y-z;

System.out.println(x);