### Archive

Archive for January 3, 2009

## Java Program to find prime numbers up to a given number n – Q6

Q6: Java Program to find prime numbers up to a given number n

Prime Number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
For example: 2, 3, 5, 7, 11, 13, 19, 23, 29, etc.

```class primetill{
public static void main(String args[]){
boolean pr = false;
int a = Integer.parseInt(args);
System.out.print("Prime Numbers upto " + a + " are: " + 2);
for(int i=3, x=0; x<a; i++){
for(int j=2; j<i; j++){
if(i % j == 0){
pr = false;
break;
}
else
pr = true;
} // end of for 2
if(pr==true){
System.out.print(" " + i);
x++;
}
} // end of for 1
} // end of main
} // end of class primetill
```

… from College notes (BCA/MCA assignments):

Categories: Java

## Java Program to find weather a number is prime or not – Q5

Q5: Java Program to find weather a number is prime or not

Prime Number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
For example: 2, 3, 5, 7, 11, 13, 19, 23, 29, etc.

```class primeornot{
public static void main(String args[]){
boolean pr = false;
int a = Integer.parseInt(args);
for(int i=2; i<a; i++){
if(a % i == 0){
pr = false;
break;
}
else
pr = true;
}
if(pr==true)
System.out.println(a + " is Prime.");
else
System.out.println(a + " is not Prime.");
}
}
```

… from College notes (BCA/MCA assignments):

Categories: Java