Logical
Program
-----------------------------------
Class Program1
{
public static void
main(String...arg)
{
int a = 10,b=20;
System.out.println(a+b); - 30
System.out.println("Sum is - "+a+b); - Sum is 1020
System.out.println("Sum is - "+(a+b)); - Sum is 30
}
}
Q- what happen when
compile & run it?
class P1
{
public static void
main(String aa[])
{
int a;
System.out.println(a+10);
}
}
1- Compile & run
- print 10
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P2
{
int a;
public static void
main(String aa[])
{
System.out.println(a+10);
}
}
1- Compile & run
- print 10
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P3
{
public static void
main(String aa[])
{
static int a;
System.out.println(a+10);
}
}
1- Compile & run
- print 10
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P4
{
static int a;
public static void
main(String aa[])
{
System.out.println(a+10);
}
}
1- Compile & run
- print 10
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P5
{
int a;
public static void
main(String aa[])
{
P5 o = new P5();
System.out.println(o.a+10);
}
}
1- Compile & run
- print 10
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P6
{
public static void
main(String aa[])
{
boolean a =
null;
System.out.println(a);
}
}
1- Compile & run
- print ?
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P7
{
public static void
main(String aa[])
{
String s = null;
System.out.println(s+" Kumar");
}
}
1- Compile & run
- print ?
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P8
{
public static int
main(String aa[])
{
System.out.println("Ha Ha Ha ha Ha Ha");
return 0;
}
}
1- Compile & run
- print - Ha Ha Ha ha Ha Ha
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P9
{
public static void
main(String aa[])
{
System.out.println("Welcome "+aa[2]);
}
}
run with -
c:\>java P9
Good Morning
1- Compile & run
- print ?
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P10
{
public static void
main(String aa[])
{
float a = 100;
System.out.println(a);
}
}
1- Compile & run
- print ?
2- Compile Time
error
3- compile but not
run
4- None
_________________________________________________________
class P11
{
public static void
main(String aa[])
{
float a =
100.99;
System.out.println(a);
}
}
1- Compile & run
- print ?
2- Compile Time
error
3- compile but not
run
4- None
class Palindrom
{
public static void
main(String a[])
{
int n=578;
int r,sum=0,temp=0;
temp=n;
while(n!=0)
{
r=n%10;
n=n/10;
sum=sum*10+r;
//System.out.println(n);
}
if(temp==sum)
System.out.println("Number
is palindrom");
else
System.out.println("not
palidrom");
}
}
*
***
****
class Patrn
{
public static void
main(String ar[])
{
for(int
i=0;i<=5;i++){
for(int
j=0;j<=i;j++){
System.out.print("
*");
}
System.out.println("");
}
}
}
perfect number
__________________________________________________
import
java.util.Scanner;
class Perfect
{
public static void
main(String arg[])
{
int n,i=1,sum=0;
System.out.println("Enter
the number");
Scanner sc=new
Scanner(System.in);
n=sc.nextInt();
while(n>i){
if(n%i==0)
{
sum=sum+i;
}i++;}
if(sum==n)
System.out.println("perfect
num");
else
System.out.println("not
perfect num");
}
}
Prime number find
_______________________________________________________________________________
import java.util.*;
class PrimeCheck
{
public static void
main(String ar[])
{
int n=101,i,flag=0;
for(i=2;i<=n/2;i++)
{
if(n%i==0)
flag=1;
}
if(flag==1)
System.out.println("its
not a prime number");
else
System.out.println("its
a prime number");
}
}
OR
class PrimeNumber
{
public static void
main(String ar[])
{
int n=5, flag=0;
for(int i=2;i<n;)
{
if(n%i==0)
{
System.out.println("The
given no is not prime");
ch=1;
break;
}
else
{
i++;
}
if(ch==0)
{
System.out.println("The given no is prime");
}
}
}
Reverse of number
_______________________________________________________________________
import
java.util.Scanner;
class ReverseNumer
{
/*
num=123;
mod=123 % 10;=3
num=num/10;=12
sum=*10
*/
public static void
main(String arg[])
{
int r,sum=0,num=0;
Scanner sc=new
Scanner(System.in);
System.out.println("Enter
a number!!");
int n=sc.nextInt();
while(n!=0)
{
r=n%10;
n=n/10;
sum=sum*10+r;
}
System.out.println("Reverse
of number is="+sum);
}
}
Sum of digit(123=sum
is 6)
___________________________________________________________________________
import java.util.*;
class SumDigit
{
public static void
main(String ar[])
{
int
num,r,sum=0,d=0;
System.out.println("Enetr
the number");
Scanner sc=new
Scanner(System.in);
num=sc.nextInt();
while(num!=0)
{
r=num%10;//123/10
num=num/10;//123/10
sum=sum+r;
}
System.out.println("The
sum is="+sum);
}
} ____
Swaping of number
_______________________________________________________________
class Swap
{
public static void
main(String arg[])
{
int a=10;
int b=20;
int temp;
System.out.println("VAlue
of a" +a);
System.out.println("VAlue
of b" +b);
temp=a;
a=b;
b=temp;
System.out.println("VAlue
after swaping");
System.out.println("VAlue
of a" +a);
System.out.println("VAlue
of b" +b);
}
} __________________________________
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