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en:iot-open:programming_fundamentals_rtu:program_control_structures [2018/01/23 09:43] – Agrisnik | en:iot-open:programming_fundamentals_rtu:program_control_structures [2020/07/20 09:00] (current) – external edit 127.0.0.1 | ||
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==== Boolean operators ==== | ==== Boolean operators ==== | ||
- | The Boolean logical operators | + | Three Boolean logical operators |
- | * ! (logical | + | * ! (logical |
- | * && (logical | + | * && (logical |
- | * || (logical | + | * || (logical |
+ | Examples: | ||
+ | <code c> | ||
+ | //logical NOT | ||
+ | if (!a) { //the statement inside " | ||
+ | b = !a; //the reverse logical value of " | ||
+ | } | ||
+ | //logical AND | ||
+ | if (a && b){ //the statement inside " | ||
+ | //statement | ||
+ | } | ||
- | ===== Switch ===== | + | //logical OR |
- | Switch...case | + | if (a || b){ //the statement inside " |
+ | // | ||
+ | } | ||
+ | </ | ||
+ | ===== Switch case statement ===== | ||
+ | Switch statement similar like //if// statement controls the flow of program. The code inside //switch// is executed in various conditions. A //switch// statement compares the values of a variable to the specified values in the //case// statements. Allowed data types of the variable are //int// and //char//. The //break// keyword exits the //switch// statement. | ||
+ | Examples: | ||
+ | <code c> | ||
+ | switch (x) { | ||
+ | case 0: //executes when the value of x is 0 | ||
+ | // statements | ||
+ | | ||
+ | case 1: //executes when the value of x is 1 | ||
+ | // statements | ||
+ | | ||
+ | | ||
+ | // statements | ||
+ | | ||
+ | } | ||
+ | </ | ||
+ | |||
+ | |||
+ | **Check yourself** | ||
+ | 1. Which code part is correct? | ||
+ | |||
+ | * if (value == 1) digitalWrite(13, | ||
+ | * if (value == 1); digitalWrite(13, | ||
+ | * if (value == 1) DigitalRead(13, | ||
+ | 2. What is the output of the next code part? | ||
+ | |||
+ | <code c> | ||
+ | int x = 0; | ||
+ | |||
+ | switch(x) | ||
+ | { | ||
+ | |||
+ | case 1: cout << " | ||
+ | |||
+ | case 0: cout << " | ||
+ | |||
+ | case 2: cout << " | ||
+ | |||
+ | } | ||
+ | </ | ||
+ | 3. In which cases ' |