Good afternoon, hope you all are fine?.....let's continue from were we stopped.
Let's look into the data types in java.
A simple interest program(formula is PRT/100)
public Simple interest{
public static void main(String [] arts){

int t=2;
Int r=10;
int p=11000;
double si=(p*r*t)/100;
System.out.println("the simple interest is:" + si);
}
}

Output: the simple interest is: 2200.0

Pls note I am using my phone for the tutorial this afternoon, so pardon my typos, if any ( am telling u because of all this nairaland programmers).

Explanation of the code:

I told before that our variables must be assigned a data type. Our variables are p,r,t (which are the principal, rate and time respectively). And si(simple interest) which will hold our simple interest after calculation.

Note that the data type given to prt is the int data type. Remember that 2, 10 and 11000 are whole numbers. But our si is double because simple interest usually ends up with decimal numbers after calculations. We don't know what our answer will be, so we have to use the double data type if at all the answer will be a decimal number.

So, the data type u assign to a variable depends on the value of that variable. So if at all you know the answer for the simple interest above will be 2200, then you can assign the data type of "si" as int because 2200 is a whole number.

NOTE: there is something known as data type compatibility, don't assign data types anyhow

Note that, Java is case sensitive, meaning that, Jas is different from jas, e is different from E, so check your variables

i need to learn java to be able to bind it with python for an android app

codedtony:
i need to learn java to be able to bind it with python for an android app

You don't need to bind it

[quote author=Jas80 post=85901303]

i do for the machine learning part of the project

[quote author=codedtony post=85901433][/quote]
Ok

Please I am looking for an apartment in ejigbo,canor-ajao axis mushin, reply this thread if you have any idea of who I can contact.,....abeg na better self contain o

Hello guys, who is still interested in learning java, it has been a while

Jas80:
Hello guys, who is still interested in learning java, it has been a while

We are following keep it up

Good evening everyone, it has been a while. I have been too busy. For those of you who are still interested I will be continuing from were we stopped

So, in our last post, we talked about arithmetic operators, and we also wrote a simple interest program, using the arithmetic operators.

Today we are going to be be talking about logical operators. Logical operators are very useful operators you are going to need for your java programs. Below are some examples of logical operators.

The & Operator:
This operator checks two expression and returns true if both expressions are correct. For example, let's consider the program below.

public class Check {
public static void main (String args[]){

int a=20;
int b= 30;

System.out.println(a<b && b>20);
}
}

The output of the above program will be true. Because our variables a and b has the value of 20 and 30 respectively. from our expression, a<b, is correct because a =20 and b= 30, 20 is less than 30, so our first expression is true. Our second expression says b>20, this is also true because 30 is greater than 20. Hence, the output : true.

Note that, the && operator returns true only when both expression is true. Otherwise it returns false. That is to say that, it returns false when only one condition is true and returns false also when both expressions are false.

The || operator (or operator).

This operator returns true if both expressions or only one expression is true. It returns false only when both expressions are wrong.

For example.

public class Check {
public static void main (String args[]){

int a =20;
int b=15;

System.out.println(a>5 || b<10);
}
}

The output of the above code will be true. Because the first expression is true, a is 20, 20 is greater than 5, so this expression is correct. Our second expression is wrong because b is 15, and 15 is greater than 10.

Note, this operator is also called the or operator. It returns true if one of the expression is true, and returns false when both expressions are false

So, try the above codes and get back to me. That's all for now.

Ask your questions

Thanks we are following

I am also following

carry on am following.

Good afternoon y'all

Last time we talked about the "and" and "or" operator, there are several other types of operators in programming. Maybe we will talk about some today.

Some words of wisdom before we start

The beauty about learning a programming language is that, you can use the experience you get from it to work with other programming languages. For example, all programming languages uses stuffs like loops, statements, arrays e.t.c

We all know all the advantages associated with being a programmer, so I advise you to never give up on the language even when you are finding it difficult to understand. All you have to do is, relax and come back at it with all you have got.

Let's go

Let's take a look at some other operators.

public class Example {

public static void main (String args []){

int a=20;
int b=30;

a+=b;

System.out.println(a);

}
}

The output of the above program will be:50.

How? The += operator add the value of the right hand expression to the initial value of the left hand side expression. From the program, initially, a was 20, and b =30. But from our program, we used the += operator. So, the value of be is added to the value of a


public class Example {

public static void main (String args []){

int a=20;
int b=30;

a-=b;

System.out.println(a);

}
}

The value of a will be -10.

public class Example {

public static void main (String args []){

int a=20;
int b=30;

a*=b;

System.out.println(a);

}
}
The value of a will be 600.

Hope you get the logic behind the programs above. Ask your questions

Another important operator in java is the modulus operator (%). As you can see, this operator is represented using the percentage symbol.

This operator returns the remainder of a value after division.

For example, 5%4, will return 1, because 4 will go into 5 once, and the reminoder will be 1.

10% 6; will return 4, because 6 can go into 10 only once and the remainder will be 4. So, that is that for the modulus operator.


Exercise:
public class Example {

public static void main (String args []){

int a=5;
int b=3;

a%=b;

System.out.println(a);

}
}

Drop the answer below.

Waiting for your answers.

Another important concept in java is the if statement, if...else statement, if ....else if statement.

if statement

Basically, this statement is used to check whether an expression is correct or not. If the expression is correct it returns true but if the expression is wrong it returns false.

It is used to execute a statement if the expression is true.

For example.
public class Example {

public static void main (String args []){


int result=30;

if (result<50){

System.out.println("this student failed the exam";
}
}
}

The output of the above program will be:this student failed the exam.

Explanation

From the above, the value of result is 30, and in our if statement, we asked if the value of result is less than 50, our program should display "this student failed the exam".

30 is lesser than 50, so this statement is correct, hence our expression will be executed.

Understand?

[b]If else statement

this statement has two options, one of the option is that our program should do this if the statement is correct, the other option is that our program should do something else, if the expression is not correct.


public class Example {

public static void main (String args []){


int result=30;

if (result<50){

System.out.print("student failed";}
else{
System.out.print("student passed";
}


}
}

Output: student failed

Let's try something else.

public class Example {

public static void main (String args []){


int result=70;

if (result<50){

System.out.print("student failed";}
else{
System.out.print("student passed";
}


}
}
Output: student passed

Hope you understood what happened