JAVA

 package arrays; import java.util.Scanner; public class AverageMarksOfStudents { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("Enter the number ofstudents : "); int n = sc.nextInt(); int[] marks = new int [n]; for(int i = 0; i<n ; i++) { marks [i] = sc.nextInt(); } int averageMarks = 0; for(int i = 0; i<n ; i++) { averageMarks += marks[i]; } averageMarks /= n; System.out.println("The average marks of students are "+ averageMarks); } }

 package arrays; import java.util.Scanner; public class ArrayIntro { public static void main(String[] args) { /* int[] marks; marks = new int[5]; */ //int marks[] = new int [5]; //ALL ARE SAME int[] age = {2,4,8,16,32}; double[] percentage = {1.0,3.14,4.6,78}; Scanner sc = new Scanner(System.in); while(6>age.length) { int n = sc.nextInt(); System.out.println(age[n-1]); }}}

 package whileLoops; import java.util.Scanner; public class PalindromeNumber { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int temp = n; int reversedNumber = 0; while(temp>0) { int lastDigit = temp % 10; reversedNumber = reversedNumber * 10 + lastDigit; temp /= 10; } if (reversedNumber == n) { System.out.println(n+ "  is palindrome"); } else { System.out.println(n + " is not a palindrome"); } } }

 package whileLoops; import java.util.Scanner;  public class SumOfDigits { public static void main(String[] args) { Scanner sc = new  Scanner(System.in); int n = sc.nextInt(); int temp = n; int sum = 0; while(temp >0) { int lastDigit = temp%10; temp /= 10; sum += lastDigit; System.out.println(" Last Digit " + lastDigit + " temp " + temp + " Sum " + sum); } System.out.println("The sum of all digit of " + n + " is " + sum); } }

 package nestedForLoop; import java.util.Scanner; public class Pattern4 {   public static void main(String[] agrs) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); for(int i = 1;i<=a ;i++) { for(int j = 1;j<=a-i ; j++) { System.out.print("  "); } for(int j = 1;j<=i ;j++) { System.out.print("x  "); } System.out.println(); } } }

 package nestedForLoop; import java.util.Scanner; public class Pattern2 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); for(int i=1; i<=a; i++) { for(int j=1; j<=i; j++) { System.out.print("x "); } System.out.println(); } } }

 package nestedForLoop; import java.util.Scanner; public class Pattern3 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); for(int i=1; i<=a; i++) { for(int j=1; j<=i-1; j++) { System.out.print("  "); } for(int j=1; j<=a-i+1;j++) { System.out.print("* "); } System.out.println(); } } }

 package nestedForLoop; import java.util.Scanner; public class Pattern1 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int a = sc.nextInt(); for(int j=1; j<=a; j++) { for(int i=1; i<=a; i++) { System.out.print("x "); } System.out.println(); } } }

 package loops; import java.util.Scanner; public class SeriesSum2 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); float result = 0; for(float i = 1; i <=n ; i++) { if(i%2==0) { result -= 1/i; }else { result += 1/i; } System.out.println(result); } }

 package loops; import java.util.Scanner; public class HarmonicSeriesSum { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); float result = 0; for(float i = 1; i <=n ; i++) { result += 1/i; } System.out.println(result); } }

 package loops; import java.util.Scanner; public class PrimeNumberFinder { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); boolean isPrime = true; for(int i= 2; i*i <=n; i++) { if(n%i ==0) isPrime = false; break; } if(n<2) isPrime = false; System.out.println("Is prime " + isPrime); } }  

 package userInput; import java.util.Scanner; public class ScannerUserInput { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter Principal"); int principal = sc.nextInt(); System.out.println("Enter Rate"); float rate = sc.nextFloat(); System.out.println("Enter Time"); int time = sc.nextInt(); float simpleIntrest= principal * rate * time /100; System.out.println("The Simple Intrest is:" + simpleIntrest); } }

 package conditionalStatements; import java.util.Scanner; public class Calculator { public static void main(String[] args) { Scanner sc =new Scanner(System.in); System.out.println("Enter Your 1st number"); int a = sc.nextInt(); System.out.println("Enter Your 2nd number"); int b = sc.nextInt(); System.out.println("Enter your operation"); sc.nextLine(); char operation = sc.nextLine().charAt(0); int result = 0; switch(operation) { case '+': result = a+b;break; case '-': result = a-b;break; case '*': result = a*b;break; case '/': result = a/b;break; case '%': result = a%b;break; default :System.out.println("Error"); } System.out.println("Your Answer is:"+result); } }

 package conditionalStatements; import java.util.Scanner; public class SwitchCaseStatements { public static void main(String[] args) { int day = 9; /*instead of these{ if(day==1) { } if(day==2) { } if(day==3) { } if(day==4) { } if(day==5) { } if(day==6) { } if(day==7) { }  We Will use the given below */ switch(day) { case 1:System.out.println("Sunday");break; case 2:System.out.println("Monday");break; case 3:System.out.println("Tuesday");break; case 4:System.out.println("Wednesday");break; case 5:System.out.println("Thursday");break; case 6:System.out.println("Friday");break; case 7:System.out.println("Saturday");break; default:System.out.println("Invalid");break; } Scanner sc =new Scanner(System.in); System.out.println("Give Rating"); int rating =sc.nextInt(); switch(rating...

 package loops; import  java.util.Scanner; public class Factorial { public static void main(String[] args) { Scanner sc= new Scanner(System.in); System.out.println("Enter Number : "); int n = sc.nextInt(); int f =1; for(int i = n; i>=1; i--) { f=f*i; } System.out.println("Your Answer Is: "+f); } }

 package loops; import java.util.Scanner; public class FibonacciNumbers { public static void main(String[] args) { /* Fibonacci numbers mai last ke 2 number ka sum hota hai agla number jese 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181..... */ Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int a = 0; int b = 1; System.out.print(a +" "); System.out.print(b +" "); for(int i = 0; i<n-2; i++){ int c = a+b; System.out.print(c+" "); a = b; b = c; }   } }