Control Flow Statements

Question 1

Type Casting

Answer 1

• when you convert a value from one primitive data type to another type

Question 2

Widening Casting

Answer 2

• converts a smaller type to a larger size type

- done automatically

Question 3

Narrowing Casting

Answer 3

• converts a larger type to a smaller size type
• it can be done manually by placing the type in parenthesis in front of the value

code example

double myDouble = 9.78d;
int myInt = (int) myDouble;

Question 4

What is the four key control flow statements in Java?

Answer 4

• switch
• for
• while
• do-while

Question 5

switch statement

Answer 5

• used to select one of many code blocks to be executed.
• syntax:

switch (expression) {
  case  x:
      // code block
      break;
  case  y:
      // code block
      break;
  default:
      // code block
      break;
}

Question 6

for statement

Answer 6

syntax:

for (init; condition; increment) {
    // statements
}

Question 7

while statement

Answer 7

syntax:

while (condition) {
    // statements
}

Question 8

do-while statement

Answer 8

do {
    // statements
} while (condition);

Question 9

continue

Answer 9

• continue with a loop (bypass all other code in the block/body)

Question 10

continue

Answer 10

• when it is used within a loop, the loop bypasses all other code in the block/body

Question 11

break

Answer 11

• it can be used to exits the loop

Question 12

What are the difference between while and do-while statements?

Answer 12

• while loop checks the condition at the start before executing the block
• do-while loop executes the code block at least once and then the condition is checked