03 - VC Basic.md

✨ VC Basic ✨

What are the values of the variables a and b after the following code has been executed?

Draw a memory diagram to keep track of the values that each variable contains

int a = 5;
int b = 10;

a = a + b;
b = a - b;
a = a - b;

What are the types, and values of the following expressions:

1. 17/5
2. 17.0/5
3. 17/5.0
4. 17.0/5.0
5. 17%2 == 1
6. -17%2 == 1
7. 1729/10
8. 172/10
9. 17/10
10. 1/10
11. 1729%10
12. 172%10
13. 17%10
14. 1%10
15. 5 > 3
16. 5 > 3 == true

From the last two expressions, what can you say about expressions:

1. 5 > 3, and,
2. 5 > 3 == true

Is each of the following statement valid, and if so, what is the value result?

1. int result = 17/5
2. int result = 17/5.0
3. float result = 17/5
4. float result = 17/5.0

Describe what the user sees during the execution of the following program.

Please describe execution in as much detail as you can, avoiding the use of technical terminology (e.g state "a large white circle in the top right of the screen" as opposed to "a white ellipse of radius 500 centred at co-ordinates (300, 50)).

void setup() {
    size(200, 200);
}

void draw() {
    background(255);

    if (mousePressed) {
        fill(0);
        circle(width/2, height/2, 50);
    }
}

Write a processing program that:

draws a circle with radius 50, with the circle's center at the current position of the mouse. The screen should have the dimensions 200 x 200.

Assuming a, b are integer variables that holds random values, draw the flowchart for the following code:

int mystery;
if(a >= b) {
    mystery = a;
}
else {
    mystery = b;
}

Assuming a, b, c are integer variables that holds random values, draw the flowchart for the following code:

int mystery = c;
if(a >= b) {
    if(a >= c) {
        mystery = a;
    }
}
else {
    if(b >= c) {
        mystery = b;
    }
}

You can compare your solution with our solution at code2flow.

Given an integer variable named num, write a program to print:

• "Number is even" if the value in num is even
• "Number is odd" if the value in num is odd.

Write a statement that stores, in variable d, the last digit of an existing variable n. Assume n > 0.

Assuming existence of integer a, write a piece of code that stores, in variable flag,

• 1, if a is even.
• -1, if a is odd.

Assuming existence of two integers a and b, write a piece of code that stores, in variable flag,

• 1, if both a and b are even.
• -1, if both a and b are odd.
• 0, if one of a and b is even and the other one odd.

What is the value stored in result after the following code has been executed?

int result = 7;

if (result >= 10)
{
	if (result % 2 == 1)
	{
		result = 0;
	}
	else
	{
		result = 1;
	}
}
else
{
	if (result % 2 == 1)
	{
		result = 3;
	}
	else
	{
		result = 2;
	}
}