if Statement in Java - One-way Selection Control Structures

if Statement in Java - One-way Selection Control Structures

In this video, we are going to talk about if Statement

Actually, if statements are part of what we call in programming: Selection Control Structures

In programming, Control Structures provide alternatives to sequential program execution and are used to alter the flow of execution of a program

The two most common control structures are the selection and the repetition

Basically, a computer has three ways of processing a program The sequential execution process, that means the execution starts at the beginning and follows the statements in order one after the other. No decisions are made and there is no repetition

The second way a computer processes a program is by making a selection or choice to execute particular statements based on one or more conditions

The third way to process a program is by repetition which consists of executing a statement over and over using a structure called a loop

So, we will start talking about the Selection Control Structures

In Java, we have three types of selection control structures, which are the if statements, the if …. else statements and the switch structure

In this video particularly, I will show you how to use if statement in order to make a one-way selection

Here on the screen is the syntax of a one-way selection using if statement

int age = 20;

if ( age greater than 18) System.out.println(“You are eligible to vote”);

Let me explain the elements of the syntax The syntax starts with the keyword if Followed by a logical expression in between the brackets it is also called a condition Next, we have the statement The statement is also called the Action Statement, simply because it refers to the action that the program will take whenever a condition is met

In the previous videos, we talked about logical expressions and relational operators So this logical expression is extremely useful because it will allow the program to make a decision about what to do or which statement to execute The logical expression is also called a Condition because as I said, it determines whether to execute the statement that follows it or not

During the execution of this small program, if the logical expression evaluates to true then the following statement will execute But if it evaluates to false then the following statement does not execute and it is skipped

This portion of code is called a one-way selection control structure because it allows the program to select a single action

So, in this code, if the logical expression evaluates to true then we will get the message You are eligible to vote in the console But if age evaluates to false then nothing will appear in the console because the action statement has been skipped

So guys that it concerning the ... https://www.youtube.com/watch?v=qWxipSsl3ZE