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КЛЮЧЕВОЕ СЛОВО REF C# | C# ref что это и для чего нужно | C# ОТ НОВИЧКА К ПРОФЕССИОНАЛУ | # 43

КЛЮЧЕВОЕ СЛОВО REF C# | C# ref что это и для чего нужно | C# ОТ НОВИЧКА К ПРОФЕССИОНАЛУ | # 43

Channel: #SimpleCode

Случайные числа в С++

Случайные числа в С++

Channel: Оксана Еськова. Основы программирования

Математические функции в С++

Математические функции в С++

Channel: Оксана Еськова. Основы программирования

Методы расширения c# | extension методы c# | C# ОТ НОВИЧКА К ПРОФЕССИОНАЛУ | # 67

Методы расширения c# | extension методы c# | C# ОТ НОВИЧКА К ПРОФЕССИОНАЛУ | # 67

Channel: #SimpleCode

Практический курс по SQL для начинающих - #3 Соединения (JOIN)

Практический курс по SQL для начинающих - #3 Соединения (JOIN)

Channel: EngineerSpock - IT & программирование

С++

программирование

программирование для начинающих

программирование с нуля

уроки программирования

visual studio

язык С

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can take the value true and walls

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or folsworth that is, having a tibul in the

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first place such a result gives the

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comparison operation is

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familiar its less more and less than or

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equal more or equal pay

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attention to how these signs are written in the

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first place is greater or less is

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equal always on the second and there

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should not be a space between them,

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checking for equality is two

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equal signs, I think it’s clear why because

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one equal sign is an

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assignment operator, but if you need to check whether it’s

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equal or not, then these are two equal signs, don’t

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confuse them,

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it’s not equal! equals and examples of

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these operations are shown here, the results of these

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operations 3 is not equal to 6 this is true 3 is equal to 6

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this is a fall but and so on,

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but sometimes we do not have

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enough comparison operations, we

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need to create a more complex condition and

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then logical operations come to the rescue,

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we will look at three this is

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logical and or and is not

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logical and gives the result true if

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both operands are true, that is, both

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logical operations are usually described

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using a truth table that

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shows all possible values of the first

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operand, all possible values 2 and

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the result, if you look at the

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truth table for and then we see that there

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will be a corpse only if

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both a is true and a bad room, that is, this is also another

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truth, and with the help of this operation it is easy

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to write this condition for the number x

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to be in the range from 0 to 10.

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Write this down as we are

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accustomed to in mathematics. in the form of a

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double inequality will be incorrect in C

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language you need to write 2 separate

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conditions x is greater than or equal to 0 and x is less than

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or equal to 10 and combine them using the

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operation logical and

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Boolean or this two sticks gives

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the result true if at least one of the

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operands is true, that is if

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you look at the table, there will be a foul

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only when both a is a fall and b is a fall, that

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is, both operands are false in all other

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cases it will be true

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write down the conditions the number x does not belong to the

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range from 0 to 10

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means that you need to write down that x is either

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less than zero or greater than ten

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therefore, using the operation or we write like this

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x is less than 0 or x is more than ten

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logical is not a negation, that is, it gives

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the result opposite to the value of

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the argument true changes to falls off all

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changes to the same

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statement that the number x is not negative

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can be written like this x is greater than or

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equal to 0 is will be true, but it can also be

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written through negation that this is a

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negation of the fact that x is less than 0 and this

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will also be correct, and in complex logical

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expressions the highest priority is the

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operation not then the comparison operation goes by priority

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then and and logical

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multiplication into the second name and or the

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second name is logical addition, that

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is, if we look carefully, we

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see that the comparison operations are higher to come

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there than than and or or therefore these are

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the conditions, it is essentially equivalent to

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such a notation, but it seems to me that it’s

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still worth putting parentheses because this is a

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more transparent notation, it’s more understandable and It’s

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better to understand than to understand, let’s

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look at an example, here’s a

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logical expression, how to determine what is the

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result,

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but I took the growing parentheses, it’s worth srach,

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first I wrote down the value of each each

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radio comparison 7 less than two is a fall, 3

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is less than or equal to 7 is true and 8 is equal to 5

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this fall is essentially the following

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expression and the first operation performed here is

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negation not fall this is true 2 this operation is both

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logical and true this is the result of

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true and the third is an operation or fall

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or true the result will be true that is, since

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one of the operands is true then

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the result is true in the end we got

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the value true

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if when performing a logical operation

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the value of the first operand is sufficient

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to determine the result then the second

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operand is simply not calculated this

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saves program execution time and in

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some cases allows you to avoid

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unauthorized access to memory well here are

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two simple examples of the

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operation or yes and the first condition 4

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less than ten has the value true, well,

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it’s clear that there is a first operand of tinder

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and the results of the operation will also be true,

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so for more than three it is not even

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checked in the second example, we have

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an operation and before is logical and if the first

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operand is a fall, that is, less is the

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result fund then the second one, but

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this complex expression is also not calculated and not

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checked

Description:

Операции сравнения в С++. Логические операции. Урок №19 курса "Основы программирования на C/C++". Ссылки на мои курсы по программированию на платформе stepik.org: Основы программирования на С/C++: https://stepik.org/course/55918/promo Основы программирования на C/C++ Часть2: https://stepik.org/course/116440/promo Основы языка Java: https://stepik.org/course/124803/promo Объектно-ориентированное программирование на Java: https://stepik.org/course/133183/promo

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