Luyện nói tiếng Anh bằng Shadowing qua video: What's an if statement? 🤔

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All right guys, we are on if statements.
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With an if statement, you do something if a condition you set is true.
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If not, then don't do it.
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It's as simple as that.
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We'll ask a user what their age is.
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If their age is greater than or equal to 18, they'll be allowed into our site.
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If they're under 18, well, we won't let them in.
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Let's declare variable age.
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Int age.
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Then we'll create a prompt.
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standard output enter your age.
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Standard input age.
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Okay, this is how to write an if statement.
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You type if, then a set of parentheses, then a set of curly braces.
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If some condition within the parentheses is true, you perform some subset of code.
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We are going to check if age is greater than or equal to 18.
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Greater than or equal to is a comparison operator.
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There's other comparison operators such as less than or equals to, less than, greater than.
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If you need to compare if two values are equal, you use two equal signs.
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You don't wanna say equals because then you're setting age equal to 18.
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Equals is the assignment operator.
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So let's check to see if age is greater than or equal to 18.
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Then we'll print a message.
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Standard output.
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Welcome to the site.
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Okay, let's Let's try this.
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Enter your age.
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Let's say that I'm 12.
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Well, it doesn't do anything.
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Since this condition evaluated to be false, we skip over this body of code.
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If it were true, then we execute it.
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This time my age is 21.
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I hit enter.
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Welcome to the site.
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If you would rather do something else if a condition is false, you can use an else statement.
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An else statement you will place at the end.
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There is no condition.
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Else, we will print standard output.
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You are not old enough to enter.
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Okay, let's try this again.
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Enter your age.
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I'll say that I'm 12.
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You are not old enough to enter.
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That's an if statement.
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If some condition is true, you do something.
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If not, you can do something else or nothing at all.
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There are more conditions you can check by using an else if statement.
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We can check another condition by adding else if.
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If this condition is false, check this else if condition.
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Let's check to see if age is less than zero.
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That means somebody hasn't been born yet.
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You haven't been born yet.
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Okay, now check this out.
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Let's say that my age is negative 10.
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Then I hit enter.
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You haven't been born yet.
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Since this condition was false, we skip this section of code.
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Then we check the else if statement.
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Since this condition was true, we execute this body of code.
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Then skip over the else statement.
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Let's add one more else if statement.
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Else if...
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Age is greater than or equal to 100.
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Standard.
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Output.
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You are too old to enter this site.
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Okay, enter your age.
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I am 120 years old.
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I hit enter.
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Welcome to the site.
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We check these conditions one by one starting from the top.
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We stated that our age was 120 years old.
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Even though we were expecting to execute this body of code, we instead executed this body of code within the if statement.
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That's because our age was technically still greater than or equal to 18.
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So the order of your if and else if statements does matter.
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It makes a difference.
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If we need to execute this body of code, if somebody's age is greater than or equal to 100, well then we should probably move that to the top.
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Then turn it into an if statement.
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Else if age is greater than or equal to 18, we will display this message.
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Let's try this one more time.
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Enter your age.
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I am 120 years old.
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I hit enter.
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You are too old to enter this site.
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So yeah, that's an if statement.
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You do something if a condition is true.
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If not, then you don't do it.
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If you would rather do something else, you can use an else statement.
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If there's other conditions you would like to check before reaching the else statement, you can use an else if statement.
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And there's really no limit to these.
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If you would like a copy of this code, I'll post this in the comment section down below.
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And well, yeah, those are if statements in C++.

Về Bài Học Này

Bạn đang luyện tập phát âm tiếng Anh với video "What's an if statement? 🤔" bằng phương pháp Shadowing — kỹ thuật được Dr. Alexander Arguelles phổ biến rộng rãi.

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