What is else if statement

what is else if statement

What are if else statements in programming? How do I use them? Why should I care?

Jun 30,  · Alternatively referred to as elsif, else if is a conditional statement performed after an if statement that, if true, performs a function. Below is an example of an if, elsif, and else conditional statement in Perl. Nov 16,  · An if else statement in programming is a conditional statement that runs a different set of statements depending on whether an expression is true or false. A typical if else statement would appear similar to the one below (this example is JavaScript, and would be very similar in other C-style languages). var x = 1; if (x === 1) {.

I believe these are one of the easier concepts to grasp in programming because they are wbat similar to our natural speaking language. I will whar my best to make them an easy concept to grasp. So firstly lets start by explaining what they are.

An if else statement is a way of checking something in your code. If we want to know whether a number is equal to 10 we can whaf an if else statement. In natural language it would sound whhat this; if this number is equal to 10 then do something, otherwise else do something else.

In code this statement looks like this. If you try to just read all of that out then I think you will hear that it sounds pretty similar to our sentence above. It consists of five parts:. If statement:. Boolean expression:. So essentially an if statement is like a clause. Inside the parenthesis we have what is called a boolean expression. If we remember from part one what are variables in programming then we know that there is a variable called bool which can be either true or false.

A boolean expression then, is a statement that will either evaluate to true or to false. Our if statement could just as well look like this. Jf do you think would happen if we run this piece of code? So if we run this piece of code we would see something like. So our program prints; You know nothing Jon Snow.

It does this because the if statement evaluates to true. The if statement evaluates to true because we set the variable inside the parentheisis to be equal to true. So really this is just to show that our if statement checks whether the sum of what is inside it is true. We could check whether several things are true or not inside our if statement. Which sounds like this; if Jon Snow knows nothing AND the earth is flat then print this is a true statement. And in code would look like whaf.

Our program would now print; This is a true statement. Because of course the earth is flat. Okay, but on a serious note if we have a statement that is true and one that is false then the entire statement is not true. So if we take a second look at our example above as it should be. The earth is not flat as far as I know so if we set that to be false instead.

Then what happens? If the first statement is true and the second statement is true then we print; This would be a crazy world. But if either of the statements evaluates to false then both of them are not true which means we are locked out how to protect my pc from hackers our if statements scope. Comparison operators: So what are they and what do they mean? For this to work a and b have to be of the same wwhat.

And then you will more easily see whether the expression is true or not. It may be easier to hear that that does not sound right. A lot of people struggle with these operators at the start.

And I have heard tons of explantations to try to make it easier. I will give you my advice for how to think. But with the caveat that the more you code and use them the easier it will get. However, my advice would be to simply look at it as what side of the how to draw a bottlenose dolphin is biggest?

I feel like this is the easiest way to remember since it is also what the operator does. It how to combine pdf files into one without adobe acrobat what is biggest.

Think of it as an equals sign that has collapsed on one side. Now we lese combine these signs in different ways. These are what are referred to as the comparison operators because we compare something. In this case we compare a with b. These operators are referred to as logical operators. Which look like this. Our NOT! As you may or may not see. Then we simply remove it from our sentence as well and we are back to normal.

Alright so that is what our NOT operator does. These are logical, meaning that they do not work as our previous operators which compare things. Logical operators help combine multiple boolean expressions to create a single boolean output.

That may have sounded like gibberish. Consider the parenthesis of our if statement, we check if what is inside here is true. That is called evaluating a boolean expression.

AND operator: Now we may want to check several things. We only want the alarm to turn on if no one is inside the how much do 08457 numbers cost to call. Otherwise it would go off, and that would be annoying.

We are two people that live inside this house. So we only want the alarm to turn on if both Jon and Khalesi are out of the house. So essentially we want ehat check two things in our if statement.

We want to se if Jon is out. And we want to se if Khalesi is out. Our logical AND operator helps us do this. This statement now checks whether the first part evaluates to true. Is jonIsOut true or false? Then it checks if khalesiIsOut is true or false? Since both are not out, the entire expression evaluates to statemeny.

And so the alarm is not turned on. For our AND operator, both things on each side of the operator must evaluate to true. Or operator : New example. We want to be reminded either if our milk carton is completely empty or if our milk carton has less than ml of milk left.

Because ml is what we know we drink every morning. So this statement now takes care of exactly that for us. So that evaluates to false. So if either one is true then the statement is true. Since one of the parts in our statement is true. The entire statement is true. So we get into the body of our if statement. Now an else statement is not necessary.

You can just have an if statement. You can also just have several if statements in a row. So we will get into both if statements if someInput is first equal to 2 and then equal to 4.

Which could happen like this. First someInput is equal to 2. So we get into the first if statement. Then inside the first if statement we set someInput to be equal to 4 instead. This means that when our program gets to our next if statement our variable someInput will be equal to 4. So we get into our second if statement. In this case our program checks both if statements and only lets us in to the one that is true from the start.

Essentially seeing, is someInput equal to 2? Then, is someInput equal to 4? Depending on the answer qhat only get into the one that is true. The other one does not get checked again.

This can be used if we wgat multiple cases we want to check for.

Flow Diagram

The syntax of an if else statement in C programming language is ? if (boolean_expression) { /* statement (s) will execute if the boolean expression is true */ } else { /* statement (s) will execute if the boolean expression is false */ }. Oct 13,  · What are if else statements? So firstly lets start by explaining what they are. An if else statement is a way of checking something in your code. If we want to know whether a number is equal to 10 we can use an if else likedatingus.comted Reading Time: 8 mins. The else if Statement Use the else if statement to specify a new condition if the first condition is false.

In programming, it is necessary to execute statement depending on whether the condition is true or false. The if and if else are two decision making structures. Programming languages such as Java, C supports the decision-making structures such as if and if else. This article discusses the difference between if and if else. In both, the if contains the expression to evaluate. In if, the statements inside the if block will execute, if the condition is true and the control is passed to the next statement after the if block.

In the if else, if the condition is true, the statements inside the if block will execute and if the condition is false the statements in the if else block will execute. That is the key difference between if and if else. Overview and Key Difference 2. What is if 3. What is if else 4. Similarities Between if and if else 5. Side by Side Comparison —if vs if else in Tabular Form 6.

The if statement consists of expressions. An expression can contain values, operators, constants or variables. If the evaluated expression is true, then the statements inside the if block execute. If the expression is false the control is passed to the very next statement after the if block. Most programming languages assume non-zero and non-null values as true and zero as false. According to the above program, the number is a variable that can store integers. It contains the value The expression in the if block is checked.

As the number is greater than or equal to 50, the statement in the if block executes. After executing that, the control is passed in the next statement after the if block. In if else, there are two blocks. The if statement contains an expression to evaluate. At the end of the if block, the control is passed to the very next statement after the if block. If the expression is false, the control is passed to the else block and the statements of the else block execute.

At the end of the else block, the control is passed to the next statement after the else block. If the expression in the if statement is true, then the statement inside the if block will execute.

Else the statement of the else block executes. The number is less than Therefore, the else block executes. There is various decision-making structure in programming. This article discussed two of them: if and if else. In if, the statements inside the if block will execute if the condition is true and the control is passed to the next statement after the if block.

In the if else, if the condition is true, the statements inside the if block execute and if the condition is false the statements in the else block execute. That is the difference between if and if else. Point, Tutorials. Available here 2. Available here.

Her areas of interests in writing and research include programming, data science, and computer systems. My friend ask me we can perform the work of if else statment by the using of th if statement than whay we use the if else statement? Figure A program with if. Figure A Program with if else. Comments My friend ask me we can perform the work of if else statment by the using of th if statement than whay we use the if else statement?

Leave a Reply Cancel reply. The if statement is a decision-making structure that consists of an expression followed by one or more statements. The if else is a decision-making structure in which the if statement can be followed by an optional else statement that executes when the expression is false. In if, the statements inside the if block executes if the expression is true. If the expression is false the next statement after the if block executes.

In if else, the if block executes if the expression is true and if the expression is false the control is passed to the else block.

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