How do you write a program to print prime numbers from 1 to 50 in PHP?

Answer 1

The following PHP Code will display the prime numbers between 2 and 50.

You know that 1 is not a Prime number so edit the value for "first for loop" according to your requirements (you can also do it for 2 to 1000 or from 900 to 929)

Output will be:

2is a prime number

3is a prime number

5is a prime number

7is a prime number

11is a prime number

13is a prime number

17is a prime number

19is a prime number

23is a prime number

29is a prime number

31is a prime number

37is a prime number

41is a prime number

43is a prime number

47is a prime number

for($i=2;$i<=50;$i++)

{

$flag=0;// assume prime

for($j=2;$j<=sqrt($i);$j++)

if(($i%$j)==0)

{

$flag=1;

break;

}

if($flag==0)

echo $i."is a prime number
";//
for jumping to next line after displaying this line..

}

?>

2013-02-22: Replaced $i/2 with sqrt($i) for efficiency by Ryankirgan