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presentation	Week 1, session 2: Introduction

class: title

5CCYB041

OBJECT-ORIENTED PROGRAMMING

Week 1, session 2

Introduction

Other forms of iteration

The for loop is by far the most commonly-used looping structure, but others exist and are sometimes more appropriate

--

The while loop takes this form:

while (condition)
  statement;

This will keep running statement as long as condition is true

--

The do ... while loop takes this form:

do 
  statement;
while (condition);

This will also run statement as long as condition is true. The difference with the regular while loop is that condition is tested after running statement

Other forms of conditional execution

The if statement is by far the most common structure for conditional execution, but other forms exist.

The switch statement allows you to execute different section of code depending on the value of a variable. It takes this general form:

switch (variable) {
  case value1: 
    statement;
    ...
    statement;
    break;
  case value2:
    statement;
    break;
  ...
  default:
    statement; 
}

Other forms of conditional execution

The if statement is by far the most common structure for conditional execution, but other forms exist.

The switch statement allows you to execute different section of code depending on the value of a variable. It takes this general form:

`switch` (variable) {
  case value1: 
    statement;
    ...
    statement;
    break;
  case value2:
    statement;
    break;
  ...
  default:
    statement; 
}

.explain-bottom[ the switch keyword denotes the start of our conditional section of code ]

Other forms of conditional execution

The if statement is by far the most common structure for conditional execution, but other forms exist.

The switch statement allows you to execute different section of code depending on the value of a variable. It takes this general form:

switch (`variable`) {
  case value1: 
    statement;
    ...
    statement;
    break;
  case value2:
    statement;
    break;
  ...
  default:
    statement; 
}

.explain-bottom[ variable is the variable whose value will determine the code to run ]

Other forms of conditional execution

The if statement is by far the most common structure for conditional execution, but other forms exist.

The switch statement allows you to execute different section of code depending on the value of a variable. It takes this general form:

switch (variable) {
* case value1: 
    statement;
    ...
    statement;
    break;
  case value2:
    statement;
    break;
  ...
  default:
    statement; 
}

.explain-bottom[ for each value of variable that we want to handle (e.g value1), we use the case keyword to label the matching section of code, using this syntax ]

Other forms of conditional execution

The if statement is by far the most common structure for conditional execution, but other forms exist.

The switch statement allows you to execute different section of code depending on the value of a variable. It takes this general form:

switch (variable) {
  case value1: 
*   statement;
*   ...
*   statement;
    break;
  case value2:
    statement;
    break;
  ...
  default:
    statement; 
}

.explain-bottom[ immediately after the case label, we insert the code to be run. This can consist of multiple lines – no need for braces here. ]

Other forms of conditional execution

The if statement is by far the most common structure for conditional execution, but other forms exist.

The switch statement allows you to execute different section of code depending on the value of a variable. It takes this general form:

switch (variable) {
  case value1: 
    statement;
    ...
    statement;
*   break;
  case value2:
    statement;
    break;
  ...
  default:
    statement; 
}

.explain-bottom[ ... but we do need to close off the last statement of the code for that case with the break keyword!

More on the break statement shortly... ]

Other forms of conditional execution

The if statement is by far the most common structure for conditional execution, but other forms exist.

The switch statement allows you to execute different section of code depending on the value of a variable. It takes this general form:

switch (variable) {
  case value1: 
    statement;
    ...
    statement;
    break;
  case value2:
    statement;
    break;
  ...
* default:
    statement; 
}

.explain-middle[ We can also have a catch-all default label at the end, which will be executed in case none of the other labels matched ]