Basic Programming

1)Factorial

Int num= Integer.parseInt(jTextField1.getText());

 Int fact=1, a;

For(a=1;a<=num;a++)

{

Fact=fact*a;

}

System.out.println(fact);

 

2)Sum of digits:

Int num= Integer.parseInt(jTextField1.getText());

Int digit, sum=0;

While(num>0)

{

Digit=num%10;

Sum=sum+digit;

Num=num/10;

}

System.out.println(sum);

3) Reversing the digits:

Int num= Integer.parseInt(jTextField1.getText());

Int digit, rev=0;

While(num>0)

{

Digit=num%10;

Rev=rev*10+digit;

Num=num/10;

}

System.out.println(rev);

4)Palindrome or not

Int num= Integer.parseInt(jTextField1.getText());

Int digit, rev=0;

Int y=num;

While(num>0)

{

Digit=num%10;

Rev=rev*10+digit;

Num=num/10;

}

If(y==rev)

System.out.println(“ It is a palindrome”);

Else

System.out.println(“ It is not a palindrome”);

5) Armstrong number

Int num= Integer.parseInt(jTextField1.getText());

Int digit, sum=0;

Int y=num;

While(num>0)

{

Digit=num%10;

Sum=sum+(digit*digit*digit);

Num=num/10;

}

If(y==sum)

System.out.println(“ It is an Armstrong number”);

Else

System.out.println(“ It is not a Armstrong number”);

6) Prime number

Int num= Integer.parseInt(jTextField1.getText());

Int  a=1;

For(int i=2;i<n;i++)

{

If(num%i==0)

{

   a=0;

Break;

}}

If(a==1)

System.out.println(“ It is a prime number”);

Else

System.out.println(“ It is not a prime number”);

7) Palindrome of a string

String a = jTextField1.getText();

int b = a.length();

String c = "";

while (b>=1)

{ String k = a.substring(b-1,b);

c=c.concat(k);

b--;

}

if (a.equals(c))

jTextField2.setText("Palindrome");

else

    jTextField2.setText("Not Palindrome");