LOOPING PROGRAMS

wap to check a no. is Armstrong or not.

    Solution:-

import java.io.*;

public class fourteen

{

public static void main()throws IOException

{

    BufferedReader d=new BufferedReader(new InputStreamReader(System.in));

     System.out.println("Enter the value of n:-");

    int n=Integer.parseInt(d.readLine());

    int m=n,s=0,r;

    while(m>0)

    {

        r=m%10;

        s=s+(r*r*r);

        m=m/10;

    }

    if(n==s)

        System.out.println("Number is Armstrong Number");

    else

        System.out.println("Number is not Armstrong Number");

    }

}

Output

Enter the value of n:-

153

Number is Armstrong Number

Variable Description

Variable	Type	Purpose
n	Integer	Storing number for checking
m	Integer	Duplicate copy of n
s	Integer	For doing the sum of digit’s cube
r	Integer	For storing the digit of number

 wap to accept the age of n employees & count the numbers of persons in the following age group

    (i) 26 – 35 (ii) 36 – 45    (iii) 46 – 55

Solution:-

import java.io.*;

public class thirteen

{

public static void main()throws IOException

{

    BufferedReader d=new BufferedReader(new InputStreamReader(System.in));

    System.out.println("Enter the value of n:-");

    int n=Integer.parseInt(d.readLine());

    int age,a=0,b=0,c=0;

    for(int i=1;i<=n;i++)

    {

        System.out.println("Enter the age of a person:-");

        age=Integer.parseInt(d.readLine());

       

        if(age>=26&&age<=35)

            a++;

        if(age>=36&&age<=45)

            b++;

        if(age>=46&&age<=55)

            c++;

    }

    System.out.println("Age Group 26- 35 :- "+a);

    System.out.println("Age Group 36- 45 :- "+b);

    System.out.println("Age Group 46- 55 :- "+c);

}

}

Output

Enter the value of n:-

6

Enter the age of a person:-

36

Enter the age of a person:-

54

Enter the age of a person:-

27

Enter the age of a person:-

52

Enter the age of a person:-

38

Enter the age of a person:-

29

Age Group 26- 35 :- 2

Age Group 36- 45 :- 2

Age Group 46- 55 :- 2

Variable Description

Variable	Type	Purpose
i	Integer	Counter Variable
age	Integer	For storing age of a person
n	Integer	Number of person
a	Integer	For counting no. of person
b	Integer	For counting no. of person
c	Integer	For counting no. of person

Write a program to display the following   

    *

    ***

    *****

    ***

    *

public class tweleb

{

public void main()

{

for(int i=1;i<=5;i=i+2)

{

    for(int j=1;j<=i;j++)

        System.out.print("*");

System.out.println();

}

for(int i=3;i>=1;i=i-2)

{

    for(int j=1;j<=i;j++)

        System.out.print("*");

System.out.println();

}

}

}

Output

    *

    ***

    *****

    ***

    *

Variable Description

Variable	Type	Purpose
i	Integer	Counter Variable
j	Integer	Counter Variable

 Write a program to display the following

    56789

    6789

    789

    89

    9

Solution:-

public class twele

{

public void main()

{

for(int i=5;i<10;i++)

{

    for(int j=i;j<10;j++)

        System.out.print(j);

System.out.println();

}

}

}

Output

56789

6789

789

89

9

 Variable Description

Variable	Type	Purpose
i	Integer	Counter Variable
j	Integer	Counter Variable

 Write a program to find sum of the series using function int fact(int)

//x – x3/3! + x5/5! – x7/7! ……………………xn/n!

Solution:-

public class seven

{

public void main(int n,int x)

{

double sum=0;

int f;

double p;

int sign=1;

for(int i=1;i<=n;i=i+2)

{

    p=Math.pow(x,i);

    f=fact(i);

    sum=sum+(p/f)*sign;

    sign=sign*-1;

}

System.out.println("Sum is :- " + sum);

}

public int fact(int a)

{

    int x=1;

    for(int i=1;i<=a;i++)

        x=x*i;

    return x;

}}

Output

n=5

x=2

Sum is :- 0.9333333333333333

Variable Description

Variable	Type	Purpose
n	Integer	Storing number of terms in series
x	Integer	Storing value of x in series
i	Integer	Counter Variable
f	Integer	Storing factorial of given integer
sum	double	Storing result
p	double	Storing power of given number
a	integer	Passing argument in function fact()
x	integer	Returning value from function fact()