I am neo java week 3

 

Week-3 Skill Builder

1. Janu and Banu are playing a mathematical game. Janu wants to test Banu's calculation speed. So she decided to ask a question that includes, multiplication, division, and addition

import java. io.*; import java. lang.*; import java. util.*; class GFG { public static double sumOfSeries(double num){ double res = 0, fact = 1; for (int i = 1; i <= num; i++) { fact = fact * i; res = res + (i / fact); } return(res) ; } // Driver Code public static void main (String[] args){ Scanner sc = new Scanner(System. in); int n = sc. nextInt(); System. out. println(sumOfSeries(n) ); }}

2. Write a program to find the factorial of a number.

import java. util. Scanner; class Main{ public static void main(String args[]){ int n, c, fact = 1; Scanner in = new Scanner(System. in); n = in. nextInt(); if (n < 0) System. out. print("Invalid"); else{ for (c = 1; c <= n; c++) fact = fact*c; System. out. print(n+": "+fact); } }}

3. Write a program to print the odd numbers upto N.

import java. util. Scanner; class Main{ public static void main(String[] args){ Scanner in=new Scanner (System. in) ; int i, N; N=in. nextInt( ); if (N>0){ for (i = 1; i <= N; i++) { if (i % 2 == 0) continue; System.out. print (i + " "); }} else System. out. print("Invalid"); }}

4. Math Challenge In connection to the National Mathematics Day celebration

import java. io.*; import java. util.*; class Mathchallenge { public static void main(String [] args) { int s, p, i, j, n, a=0, c=0; Scanner sc = new Scanner(System. in) ; s = sc.nextInt( ); p = sc.nextInt( ); for (i=1; i<=p; i++) { n=i; for(j=1; j<=p;j++){ if(n%j==0){ c++;n++;} else break; } if(c==s) a++; c=0; } System.out.println(a); }}

5. Write a program to find the factorial of a given number.

import java. util. Scanner; class Main{ public static void main(String args[]){ int n, c, fact = 1; Scanner in = new Scanner(System. in) ; n = in. nextInt(); if (n < 0) System. out. print("Invalid"); else{ for (c = 1; c <= n; c++) fact = fact*c; System. out. print(fact); } }}

6. Seetha was shocked after seeing her electricity bill of May month.

import java. util. Scanner; class ComputeElectricityBill{ public static void main(String args[]) { long units; Scanner sc=new Scanner(System. in) ; units=sc . nextLong(); double billpay=0; if(units<=100) billpay=0; else if(units<=200) billpay=(units-100)*1.5; else if(units<=500) billpay=200+(units-200)*3; else billpay=350+1380+(units-500)*6.6; System. out . println(billpay); }}

7. Write a program to find the prime number.

import java. util. Scanner; class Main{ public static void main(String args[ ]) { int n, i, s=0; Scanner in=new Scanner(System. in); n=in. nextInt() ; if (n<2) System. out . print (n+":Invalid"); else { for (i=1; i<=n; i++) if(n%i==0) s++; if (s==2) System. out. print (n+":Prime"); else System.out.print(n+":Composite"); }}}

8. Lucky Cards

import java. io.*; import java.util.*; class Luckycards { public static void main(String [] args) { int n,i,j,c1=0,c2=0,c3=0,k; Scanner sc = new Scanner(System. in); n = sc.nextInt(); int a[]=new int[n]; for (i=0;i<n; i++){ a[i] = sc.nextInt(); if(a[i]==1)a[i]=14; } for ( i=0 ; i<n ; i++ ){ k=a[i]%10; if((a[i]>10)&&(i+k<n)){ for (j=1; j<=k;j++) { if(a[i+j]<11) c1++; } if (c1==k){ if (i%2==0){ System. out. println("Player A scores "+c1+" point(s)"); c2=c2+k; } else{ System. out. println("Player B scores "+c1+" point(s)"); c3=c3+k; }} c1=0; }} System. out. println("Player A: "+c2+" point(s)"); System. out. println("Player B: "+c3+" point(s)"); }}

9. Write a program to find whether a number is neon number or not.

import java. util.*; public class Main{ Main(int num) { if (num<=20) { int square=num*num; int sum=0; while ( square!=0){ int a=square%10; sum=sum+a; square=square/10; } if (sum==num) { System. out. println(num+" :Neon Number"); } else{ System. out. println(num+" :Not Neon Number"); }} else{ System. out. print("Invalid"); } } public static void main(String args[]){ Scanner ob=new Scanner(System.in); int n=ob. nextInt(); Main obj=new Main(n); }}

10. Write a program to find the salary of a worker for n days. The 1st day salary is 10, the second day salary is 20, third day salary is 40 and so on.

import java. io.*; import java. util.*; class Main { public static void main(String [] args) { int n, salary =10, sum=10; Scanner sc = new Scanner(System. in); n = sc.nextInt(); if (n==1) System. out. println(salary); else { for (int i=2; i<=n; i++) { salary *=2; sum += salary; } System. out. println(sum) ; }}}

Challange yourself

1. Janu wants to check Ankit's mathematical knowledge. Janu will tell an number, Ankit needs to calculate the sum of the cubes of its digits and check whether it is equal to the given number.

import java. util. Scanner; class ArmstrongNumber{ public static void main(String args[]) { int n, sum = 0, temp, remainder, digits = 0; Scanner in = new Scanner (System. in) ; n = in.nextInt(); temp = n; while (temp != 0) { digits++; temp = temp/10; } temp = n; while (temp != 0) { remainder = temp%10; sum = sum + power(remainder, digits); temp = temp/10; } if (n == sum) System. out. println(n + " Hi Janu"); else System. out . println(n + " Bye Janu"); } static int power(int n, int r) { int c, p = 1; for (c = 1; c <= r; c++) p = p*n; return p; }}

2. Janu wants to write a java program to print the number of occurrences of a particular prime number from the list of all prime factors of every number between the given limits.

import java. util.*; class Main{ public static void main(String[] args) { Scanner s=new Scanner(System. in) ; int l=s. nextInt(); int r=s. nextInt(); int p=s. nextInt(); int i = 2; boolean flag = false; while(i <= p/2) { // condition for nonprime number if(p % i == 0){ flag = true; break; }++i; } if (!flag) System. out . println(getCount(l, r, p)); else System. out. println(p + " is not a prime number."); } private static int countFactors(int n, int p) { int pwr = 0; while (n > 0 && n % p == 0) { n /= p; pwr++; } return pwr; } private static int getCount(int l, int r, int p) { int cnt = 0; for (int i = l; i <= r; i++) { cnt += countFactors(i, p) ; } return cnt; }}

3. Write a program for triangular multiplication table for 0 to N.

import java. util. Scanner; class Main{ public static void main(String args[]) { Scanner in=new Scanner(System. in); int n, i, j; n=in.nextInt(); outer: for (i=0; i<=n; i++){ for (j=0; j<=n; j++) { if(j > i) { System. out. println( ) ; continue outer; } System. out. print (" " + (i * j)); }} System. out. println( ) ; }}

14. Dora recently joined in MATHS club in her college. On the first day, she got an assignment as a part of the ice-breaking activity.

import java. util. Scanner; class PrimeNumber{ public static void main (String[] args) { Scanner scanner = new Scanner(System. in); int i =0; int num =0; String primeNumbers =""; int n = scanner . nextInt() ; scanner. close(); for (i= 1; i <= n; i++) { int counter=0; for (num =i; num>=1; num--) { if (i%num==0){ counter = counter + 1; } } if (counter ==2) { primeNumbers = primeNumbers + i + " "; } } System. out. println(primeNumbers); }}

5. After attending maths class, Karthick found an interesting link between a number and its proper divisors.

import java. util. Scanner; class PerfectNumber{ public static void main(String arg[]) { long n, sum=0; Scanner sc=new Scanner (System. in); n=sc. nextLong(); int i=1; while(i<=n/2) { if (n%i==0) { sum+=i; } i++; } if(sum==n) { System. out. println(n+" Perfect number"); } else System. out. println(n+" Not perfect number"); }}