|
1 |
| ---- |
2 |
| -title: else |
3 |
| -categories: [ "Structure" ] |
4 |
| -subCategories: [ "Control Structure" ] |
5 |
| ---- |
6 |
| - |
7 |
| - |
8 |
| - |
9 |
| - |
10 |
| - |
11 |
| -= if...else |
12 |
| - |
13 |
| - |
14 |
| -// OVERVIEW SECTION STARTS |
15 |
| -[#overview] |
16 |
| --- |
17 |
| - |
18 |
| -[float] |
19 |
| -=== Description |
20 |
| -The `if...else` allows greater control over the flow of code than the basic link:../if[if] statement, by allowing multiple tests to be grouped together. An `else` clause (if at all exists) will be executed if the condition in the `if` statement results in `false`. The `else` can proceed another `if` test, so that multiple, mutually exclusive tests can be run at the same time. |
21 |
| -[%hardbreaks] |
22 |
| - |
23 |
| -Each test will proceed to the next one until a true test is encountered. When a true test is found, its associated block of code is run, and the program then skips to the line following the entire if/else construction. If no test proves to be true, the default `else` block is executed, if one is present, and sets the default behavior. |
24 |
| -[%hardbreaks] |
25 |
| - |
26 |
| -Note that an `else if` block may be used with or without a terminating `else` block and vice versa. An unlimited number of such `else if` branches is allowed. |
27 |
| - |
28 |
| -[float] |
29 |
| -=== Syntax |
30 |
| -[source,arduino] |
31 |
| ----- |
32 |
| -if (condition1) { |
33 |
| - // do Thing A |
34 |
| -} |
35 |
| -else if (condition2) { |
36 |
| - // do Thing B |
37 |
| -} |
38 |
| -else { |
39 |
| - // do Thing C |
40 |
| -} |
41 |
| ----- |
42 |
| - |
43 |
| --- |
44 |
| -// OVERVIEW SECTION ENDS |
45 |
| - |
46 |
| - |
47 |
| - |
48 |
| -// HOW TO USE SECTION STARTS |
49 |
| -[#howtouse] |
50 |
| --- |
51 |
| -[float] |
52 |
| -=== Example Code |
53 |
| -Below is an extract from a code for temperature sensor system |
54 |
| -[source,arduino] |
55 |
| ----- |
56 |
| -if (temperature >= 70) { |
57 |
| - //Danger! Shut down the system |
58 |
| -} |
59 |
| -else if (temperature >= 60 && temperature < 70) { |
60 |
| - //Warning! User attention required |
61 |
| -} |
62 |
| -else { |
63 |
| - //Safe! Continue usual tasks... |
64 |
| -} |
65 |
| ----- |
66 |
| - |
67 |
| --- |
68 |
| -// HOW TO USE SECTION ENDS |
69 |
| - |
70 |
| - |
71 |
| - |
72 |
| -// SEE ALSO SECTION BEGINS |
73 |
| -[#see_also] |
74 |
| --- |
75 |
| - |
76 |
| -[float] |
77 |
| -=== See also |
78 |
| - |
79 |
| -[role="language"] |
80 |
| - |
81 |
| --- |
82 |
| -// SEE ALSO SECTION ENDS |
| 1 | +--- |
| 2 | +title: else |
| 3 | +categories: [ "Structure" ] |
| 4 | +subCategories: [ "Control Structure" ] |
| 5 | +--- |
| 6 | + |
| 7 | += if...else |
| 8 | + |
| 9 | + |
| 10 | +// OVERVIEW SECTION STARTS |
| 11 | +[#overview] |
| 12 | +-- |
| 13 | + |
| 14 | +[float] |
| 15 | +=== Description |
| 16 | +The `if...else` allows greater control over the flow of code than the basic link:../if[if] statement, by allowing multiple tests to be grouped together. An `else` clause (if at all exists) will be executed if the condition in the `if` statement results in `false`. The `else` can proceed another `if` test, so that multiple, mutually exclusive tests can be run at the same time. |
| 17 | +[%hardbreaks] |
| 18 | + |
| 19 | +Each test will proceed to the next one until a true test is encountered. When a true test is found, its associated block of code is run, and the program then skips to the line following the entire if/else construction. If no test proves to be true, the default `else` block is executed, if one is present, and sets the default behavior. |
| 20 | +[%hardbreaks] |
| 21 | + |
| 22 | +Note that an `else if` block may be used with or without a terminating `else` block and vice versa. An unlimited number of such `else if` branches is allowed. |
| 23 | + |
| 24 | +[float] |
| 25 | +=== Syntax |
| 26 | +[source,arduino] |
| 27 | +---- |
| 28 | +if (condition1) { |
| 29 | + // do Thing A |
| 30 | +} |
| 31 | +else if (condition2) { |
| 32 | + // do Thing B |
| 33 | +} |
| 34 | +else { |
| 35 | + // do Thing C |
| 36 | +} |
| 37 | +---- |
| 38 | + |
| 39 | +-- |
| 40 | +// OVERVIEW SECTION ENDS |
| 41 | + |
| 42 | + |
| 43 | + |
| 44 | +// HOW TO USE SECTION STARTS |
| 45 | +[#howtouse] |
| 46 | +-- |
| 47 | +[float] |
| 48 | +=== Example Code |
| 49 | +Below is an extract from a code for temperature sensor system |
| 50 | +[source,arduino] |
| 51 | +---- |
| 52 | +if (temperature >= 70) |
| 53 | +{ |
| 54 | + // Danger! Shut down the system |
| 55 | +} |
| 56 | +else if (temperature >= 60) // 60 <= temperature < 70 |
| 57 | +{ |
| 58 | + // Warning! User attention required |
| 59 | +} |
| 60 | +else // temperature < 60 |
| 61 | +{ |
| 62 | + // Safe! Continue usual tasks... |
| 63 | +} |
| 64 | +---- |
| 65 | + |
| 66 | +-- |
| 67 | +// HOW TO USE SECTION ENDS |
| 68 | + |
| 69 | + |
| 70 | + |
| 71 | +// SEE ALSO SECTION BEGINS |
| 72 | +[#see_also] |
| 73 | +-- |
| 74 | + |
| 75 | +[float] |
| 76 | +=== See also |
| 77 | + |
| 78 | +[role="language"] |
| 79 | + |
| 80 | +-- |
| 81 | +// SEE ALSO SECTION ENDS |
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