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uvhareeshuvhareesh
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Merge pull request #3 from uvhareesh/develop
Operators concept
2 parents 933edf0 + 196fd9d commit 455ebbd

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6 files changed

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-110
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6 files changed

+318
-110
lines changed

‎src/coreJava/AssignmentOperators.java‎

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package coreJava;
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public class AssignmentOperators {
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public static void main(String[] args) {
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//5. Assignment = += -+ *= /= %=
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int a=10;
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int b=10;
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a+=5; //a=a+5;
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b=b-5; //b=b-5;
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System.out.println(a);
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System.out.println(b);
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int c=10;
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a*=2; //c=c*2;
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System.out.println(c);
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int d=10;
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d/=2; //d=d/2;
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System.out.println(d);
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int e=10;
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e%=2; //e=e%2;
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System.out.println(e);
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/* difference b/w == = ?
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* == is relational operators it compares the value
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* = is assignment operator , it assigns the value
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*/
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}
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}

‎src/coreJava/DataTypes.java‎

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package coreJava;
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public class DataTypes {
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public static void main(String[] args) {
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package coreJava;
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//variables
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//int s; //declaration
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//s=100; //assignment
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int s=100; // declaration+assignment
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System.out.println(s);
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s=200;
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System.out.println(s);
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public class DataTypes {
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public static void main(String[] args) {
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//variables
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//int s; //declaration
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//s=100; //assignment
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int s=100; // declaration+assignment
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System.out.println(s);
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s=200;
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System.out.println(s);
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/*
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// approach1 // if all the variables belongs to different data types
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int p=1;
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int o=2;
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int i=3;
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*/
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/* approach2 // only if allthe variable are belongs to same data type
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/* approach2 // only if all the variable are belongs to same data type
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int p,o,i;
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p=1;
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o=2;
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i=3;
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*/
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// approach3 //only if all the variable are belongs to same data type
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int p=1,o=2,i=3;
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int p=1,o=2,i=3;
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//for meaningful message in print statement we can use concatenation method
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System.out.println("The Value of p is :"+p);
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System.out.println("The Value of o is :"+o);
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System.out.println("The Value of i is :"+i);
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System.out.println("The Value of p is :"+p);
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System.out.println("The Value of o is :"+o);
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System.out.println("The Value of i is :"+i);
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// in single line we printed all variable values
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System.out.println(p+""+o+""+i+"");
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System.out.println(p+""+o+""+i+"");
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// in print statement we used join method for each value with ""
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//--------------------------------------------------------------------------
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//--------------------------------------------------------------------------
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// Data types
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// Numeric Data Types
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int a=100, b=200;
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System.out.println("The Value of a is :"+a);
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System.out.println("The Value of b is :"+b);
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System.out.println(a+b);
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System.out.println("The sum of an and b is : "+(a+b));
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byte by=125;
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System.out.println(by);
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short sh=32767;
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System.out.println(sh);
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long l=21212121234443534L; // literal is needed
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// L should add, it can be lower or uppercase
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System.out.println(l);
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// Decimal numbers - float, double
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float item_price=15.5f; // literal is needed
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//f should add, it can be lower or uppercase
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System.out.println(item_price);
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double dbl=1234.4343412;
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System.out.println(dbl);
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// characters
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char grade='A'; // single character in single quotes - ''
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System.out.println(grade);
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String name="Harish"; // String is non-premitive type and multiple characters with double quotes - ""
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System.out.println(name);
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//char ch='abc'; //invalid
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//Stirng ch='abc';//invalid
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//String ch='A';//invalid
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String ch="A"; //valid
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System.out.println(ch);
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boolean bl=true; //allows only true or false
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System.out.println(bl);
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boolean bl1=false;//allows only true or false
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System.out.println(bl1);
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//boolean bl="true";//invalid
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//boolean bl="false";//invalid
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//String bl=true;//invalid
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String bl2="true";//valid
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//----------------------------------------------------------------------
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//difference between variable and const/final
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int x=100;
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System.out.println(x);
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x=200;
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System.out.println(x);
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final int y=300;
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System.out.println(y);
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// y=400;// not allowed
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//System.out.println(y);
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// 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.
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//java is statistically typed programming language
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//python is dynamically typed programming language
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//javascript is dynamically typed scripting language
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//Example :
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int q=100;
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//x="welcome";//it is not allowed in java but in javascript and python it is allowed
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//in python or javascript we no need to specify the data types explicitly.
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/*
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r=100;
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r="welcome";
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*/
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//it is allowed in dynamically typed programming language - javascript / python
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// Numeric Data Types
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int a=100, b=200;
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System.out.println("The Value of a is :"+a);
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System.out.println("The Value of b is :"+b);
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System.out.println(a+b);
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System.out.println("The sum of an and b is : "+(a+b));
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byte by=125;
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System.out.println(by);
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short sh=32767;
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System.out.println(sh);
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long l=21212121234443534L; // literal is needed
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// L should add, it can be lower or uppercase
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System.out.println(l);
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// Decimal numbers - float, double
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float item_price=15.5f; // literal is needed
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//f should add, it can be lower or uppercase
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System.out.println(item_price);
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double dbl=1234.4343412;
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System.out.println(dbl);
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// characters
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char grade='A'; // single character in single quotes - ''
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System.out.println(grade);
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String name="Harish"; // String is non-premitive type and multiple characters with double quotes - ""
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System.out.println(name);
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//char ch='abc'; //invalid
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//Stirng ch='abc';//invalid
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//String ch='A';//invalid
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String ch="A"; //valid
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System.out.println(ch);
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boolean bl=true; //allows only true or false
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System.out.println(bl);
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boolean bl1=false;//allows only true or false
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System.out.println(bl1);
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//boolean bl="true";//invalid
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//boolean bl="false";//invalid
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//String bl=true;//invalid
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String bl2="true";//valid
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//----------------------------------------------------------------------
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//difference between variable and const/final
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int x=100;
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System.out.println(x);
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x=200;
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System.out.println(x);
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final int y=300;
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System.out.println(y);
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// y=400;// not allowed
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//System.out.println(y);
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// 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.
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//java is statistically typed programming language
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// python is dynamically typed programming language
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//javascript is dynamically typed scripting language
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//Example :
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int q=100;
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//x="welcome";//it is not allowed in java but in javascript and python it is allowed
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//in python or javascript we no need to specify the data types explicitly.
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/*
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r=100;
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r="welcome";
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*/
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//it is allowed in dynamically typed programming language - javascript / python
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}
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‎src/coreJava/DecrementOperators.java‎

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package coreJava;
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public class DecrementOperators {
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public static void main(String[] args) {
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//5.Decrement operators --
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//case1
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int a=10;
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System.out.println(a);
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// a=a-1;
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//instead of writing 2 times "a" we can use below code
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a--;
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System.out.println(a);
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//case2 post decrement
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int b=10;
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int res=b--;
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System.out.println(res);
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//expected o/p is 11 but we received 10 because first 10 is assigned to res then value is decrement with a++
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//first assignment is happen then decrement will happen
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System.out.println(a);
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//case3 Pre increment
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int c=10;
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int res1=--c;
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System.out.println(res1);
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// first decrement the value then assignment is happen
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System.out.println(c);
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}
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}

‎src/coreJava/IncrementOperator.java‎

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package coreJava;
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public class IncrementOperator {
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public static void main(String[] args) {
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//4.Increment & Decrement operators ++ --
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//case1
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int a=10;
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System.out.println(a);
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// a=a+1;
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//instead of writing 2 times "a" we can use below code
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a++;
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System.out.println(a);
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//case2 post increment
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int b=10;
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int res=b++;
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System.out.println(res);
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//expected o/p is 11 but we received 10 because first 10 is assigned to res then value is incremented with a++
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//first assignment is happen then increment will happen
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System.out.println(a);
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//case3 Pre increment
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int c=10;
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int res1=++c;
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System.out.println(res1);
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// first increment the value then assignment is happen
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System.out.println(c);
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}
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}

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