Final exams pt 2

Question 1

Give the 4 assignment operators

Answer 1

• addition and assign: +=
• subtraction and assign: -=
• multiply and assign: *=
• divide and assign: /=

Question 1

List the 5 basic math operators

Answer 1

• addition: +
• subtraction: -
• multiplication: *
• division: /
• remainder division: %

Question 2

Write a variable to store the result of the following expressions:
2x + 3y − z

Answer 2

int result = 2 * x + 3 * y - z;

Question 3

Write a variable to store the result of the following expressions:
(2×3) /4

Answer 3

float result = (2 * 3) / 4;

Question 4

Write a variable to store the result of the following expressions:
The remainder of 4/3

Answer 4

int remainder = 4 % 3;

Question 5

Write a line of code that will add 7 to a variable and store the result in the same variable.

Answer 5

1) int num = num + 7
2) int num += 7;

Question 6

. What is the shortest line of code to increment the value of a variable by 1?

Answer 6

var++; or ++var;

Question 7

What is the shortest line of code to decrement the value of a variable by 1?

Answer 7

var–; or –var;

Question 8

What units are the screen measured in?

Answer 8

Pixels

Question 9

Give 3 examples of a graphics command. Write a command to show the syntax for each.

Answer 9

1) Rectangle: rect (x, y, w, h);
2) ellipse: ellipse (x, y, w, h);
3) triangle: triangle (x1, y1, x2, y2, x3, y3);
4) line (x1, y1, x2, y2);

Question 10

Describe the function of a for loop in 1 sentence

Answer 10

A for loop will repeat a section of code for a specified number of times.

Question 11

What 3 things must be defined in a for loop?

Answer 11

*The counter starting value
* The ending value, specified as a condition which is true as long as the loop needs to
continue
* The increment/decrement value for the counter variable

Question 12

Write code for a for loop that will:
loop 10 times, starting at 0, increasing by 1

Answer 12

for (int i = 0; i < 10; i++)

Question 13

Write code for a for loop that will:
loop 20 times, counting by 2s

Answer 13

for(int i = 1; i < 20; i+=2);

Question 14

count backwards from 100 down to 1 by 3s

Answer 14

for (int i = 100; i > 1; i -= 3)

Question 15

Write code for a for loop that will
sum up all the numbers from 1 to 100

Answer 15

int sum = 0;
for (int i = 1; i <= 100; i++)
sum = sum + i;

Question 16

Write code for a for loop that will
find the product of every odd number from -51 to 51

Answer 16

int product = 1;
for (int i = -51; i <= 51; i += 2)
product *= i;

Question 17

Write code for a for loop that will
subtract all the even numbers from 60 to 30 from 8192

Answer 17

int sum = 8192
for (int i = 60; i >= 30; i -= 2)
sum = sum - i;