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May 14, 2025
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Operators concept #3

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34 changes: 34 additions & 0 deletions src/coreJava/AssignmentOperators.java
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package coreJava;

public class AssignmentOperators {

public static void main(String[] args) {
//5. Assignment = += -+ *= /= %=

int a=10;
int b=10;
a+=5; //a=a+5;
b=b-5; //b=b-5;
System.out.println(a);
System.out.println(b);

int c=10;
a*=2; //c=c*2;
System.out.println(c);

int d=10;
d/=2; //d=d/2;
System.out.println(d);

int e=10;
e%=2; //e=e%2;
System.out.println(e);

/* difference b/w == = ?
* == is relational operators it compares the value
* = is assignment operator , it assigns the value
*/

}

}
220 changes: 110 additions & 110 deletions src/coreJava/DataTypes.java
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package coreJava;

public class DataTypes {

public static void main(String[] args) {
package coreJava;

//variables

//int s; //declaration
//s=100; //assignment

int s=100; // declaration+assignment
System.out.println(s);

s=200;
System.out.println(s);
public class DataTypes {

public static void main(String[] args) {

//variables

//int s; //declaration
//s=100; //assignment

int s=100; // declaration+assignment
System.out.println(s);

s=200;
System.out.println(s);

/*
// approach1 // if all the variables belongs to different data types
int p=1;
int o=2;
int i=3;
*/
/* approach2 // only if allthe variable are belongs to same data type

/* approach2 // only if all the variable are belongs to same data type
int p,o,i;
p=1;
o=2;
i=3;
*/

// approach3 //only if all the variable are belongs to same data type
int p=1,o=2,i=3;
int p=1,o=2,i=3;

//for meaningful message in print statement we can use concatenation method
System.out.println("The Value of p is :"+p);
System.out.println("The Value of o is :"+o);
System.out.println("The Value of i is :"+i);
System.out.println("The Value of p is :"+p);
System.out.println("The Value of o is :"+o);
System.out.println("The Value of i is :"+i);

// in single line we printed all variable values
System.out.println(p+""+o+""+i+"");
System.out.println(p+""+o+""+i+"");

// in print statement we used join method for each value with ""


//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Data types
// Numeric Data Types
int a=100, b=200;
System.out.println("The Value of a is :"+a);
System.out.println("The Value of b is :"+b);
System.out.println(a+b);
System.out.println("The sum of an and b is : "+(a+b));
byte by=125;
System.out.println(by);
short sh=32767;
System.out.println(sh);
long l=21212121234443534L; // literal is needed
// L should add, it can be lower or uppercase
System.out.println(l);
// Decimal numbers - float, double
float item_price=15.5f; // literal is needed
//f should add, it can be lower or uppercase
System.out.println(item_price);
double dbl=1234.4343412;
System.out.println(dbl);
// characters
char grade='A'; // single character in single quotes - ''
System.out.println(grade);
String name="Harish"; // String is non-premitive type and multiple characters with double quotes - ""
System.out.println(name);
//char ch='abc'; //invalid
//Stirng ch='abc';//invalid
//String ch='A';//invalid
String ch="A"; //valid
System.out.println(ch);
boolean bl=true; //allows only true or false
System.out.println(bl);
boolean bl1=false;//allows only true or false
System.out.println(bl1);
//boolean bl="true";//invalid
//boolean bl="false";//invalid
//String bl=true;//invalid
String bl2="true";//valid
//----------------------------------------------------------------------
//difference between variable and const/final
int x=100;
System.out.println(x);
x=200;
System.out.println(x);
final int y=300;
System.out.println(y);
// y=400;// not allowed
//System.out.println(y);
// variables declaration without final keyword we can change the values but wiht final keyword we cnat chaneg the value. in javascript instea dof final, const keyword is used.
//java is statistically typed programming language
//python is dynamically typed programming language
//javascript is dynamically typed scripting language
//Example :
int q=100;
//x="welcome";//it is not allowed in java but in javascript and python it is allowed
//in python or javascript we no need to specify the data types explicitly.
/*
r=100;
r="welcome";
*/
//it is allowed in dynamically typed programming language - javascript / python

// Numeric Data Types

int a=100, b=200;
System.out.println("The Value of a is :"+a);
System.out.println("The Value of b is :"+b);
System.out.println(a+b);
System.out.println("The sum of an and b is : "+(a+b));

byte by=125;
System.out.println(by);

short sh=32767;
System.out.println(sh);

long l=21212121234443534L; // literal is needed
// L should add, it can be lower or uppercase
System.out.println(l);

// Decimal numbers - float, double

float item_price=15.5f; // literal is needed
//f should add, it can be lower or uppercase
System.out.println(item_price);

double dbl=1234.4343412;
System.out.println(dbl);

// characters

char grade='A'; // single character in single quotes - ''
System.out.println(grade);

String name="Harish"; // String is non-premitive type and multiple characters with double quotes - ""
System.out.println(name);

//char ch='abc'; //invalid
//Stirng ch='abc';//invalid
//String ch='A';//invalid
String ch="A"; //valid
System.out.println(ch);

boolean bl=true; //allows only true or false
System.out.println(bl);

boolean bl1=false;//allows only true or false
System.out.println(bl1);

//boolean bl="true";//invalid
//boolean bl="false";//invalid

//String bl=true;//invalid
String bl2="true";//valid

//----------------------------------------------------------------------

//difference between variable and const/final
int x=100;
System.out.println(x);
x=200;
System.out.println(x);

final int y=300;
System.out.println(y);
// y=400;// not allowed
//System.out.println(y);

// variables declaration without final keyword we can change the values but wiht final keyword we cnat chaneg the value. in javascript instea dof final, const keyword is used.

//java is statistically typed programming language
// python is dynamically typed programming language
//javascript is dynamically typed scripting language

//Example :

int q=100;
//x="welcome";//it is not allowed in java but in javascript and python it is allowed
//in python or javascript we no need to specify the data types explicitly.

/*
r=100;
r="welcome";
*/
//it is allowed in dynamically typed programming language - javascript / python

}

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39 changes: 39 additions & 0 deletions src/coreJava/DecrementOperators.java
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package coreJava;

public class DecrementOperators {

public static void main(String[] args) {
//5.Decrement operators --

//case1
int a=10;
System.out.println(a);

// a=a-1;
//instead of writing 2 times "a" we can use below code
a--;
System.out.println(a);

//case2 post decrement

int b=10;
int res=b--;
System.out.println(res);

//expected o/p is 11 but we received 10 because first 10 is assigned to res then value is decrement with a++
//first assignment is happen then decrement will happen

System.out.println(a);

//case3 Pre increment

int c=10;
int res1=--c;
System.out.println(res1);
// first decrement the value then assignment is happen

System.out.println(c);

}

}
40 changes: 40 additions & 0 deletions src/coreJava/IncrementOperator.java
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package coreJava;

public class IncrementOperator {

public static void main(String[] args) {

//4.Increment & Decrement operators ++ --

//case1
int a=10;
System.out.println(a);

// a=a+1;
//instead of writing 2 times "a" we can use below code
a++;
System.out.println(a);

//case2 post increment

int b=10;
int res=b++;
System.out.println(res);

//expected o/p is 11 but we received 10 because first 10 is assigned to res then value is incremented with a++
//first assignment is happen then increment will happen

System.out.println(a);

//case3 Pre increment

int c=10;
int res1=++c;
System.out.println(res1);
// first increment the value then assignment is happen

System.out.println(c);

}

}
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