Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Perl...getting wrong output?

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Perl...getting wrong output?
# 1  
Old 02-24-2010
Perl...getting wrong output?
Good morning! Im trying to write and learn at the same time a simple script. fTHe script should tell me if a number is odd or even/

Code:
#!/usr/bin/perl
$num = 10;
$string1 = "This number is odd";
$string2 = "This number is even";
if ($num /= 2) {
        print "$string1\n";
}else{
        print "$string2\n";
}

The script keeps telling me that the $num is odd, when its supposed to be even. I used dividing by 2 to test even.

Can anyone explain why its not working-not just an answer please. As I said before Im trying to learn.

Bigben
Last edited by pludi; 02-24-2010 at 01:54 AM..
# 2  
Old 02-24-2010
Perl script
In if condition you used the division operation. It will always be true.Because the answer may be 0.2 , 0.3 ..etc., So that you got wrong output.
Use mod operation Instead of division operation Try this code.

Code:
my $num = 10;
my $string1 = "This number is odd";
my $string2 = "This number is even";
if ($num %= 2) {
print "$string1\n";
}else{
    print "$string2\n";
}

Last edited by pludi; 02-24-2010 at 01:55 AM.. Reason: code tags, please...
# 3  
Old 02-24-2010
Logic is wrong ,
To find even or odd we should get the modulus by 2 of any number

Code:
$num = 11;
$string1 = "This number is odd";
$string2 = "This number is even";
if ($num  %  2) {
print "$string1\n";
}else{
print "$string2\n";
}

# 4  
Old 02-24-2010
Thanks so much for the explaination!!! You rock!~
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Wrong output when writing to file

Hello, I am having problem while redirecting output to a file where as on console output is proper. for dir in */; do printf "%s, " "$dir"; ls -m "$dir"; echo; done > output.txt Output of above command is coming in single line but when i am redirecting output to a file, single line i... (10 Replies)
Discussion started by: Manoj Rajput
10 Replies

2. Shell Programming and Scripting

Script Output coming in wrong format....

Hi team, getting output logs wrong in different format from telnet script ... getting Output.txt macro_outdoor_dist-6.0.0(v4_0_2) DN:1.3.903 (1101:100:11w:500:3:2:103:aa) macro_outdoor_dist-8.1.0(v3_1_0) DN:1.3.409 (N/A)... (3 Replies)
Discussion started by: Ganesh Mankar
3 Replies

3. Shell Programming and Scripting

Output, working with files. What is wrong?

I cannot figure out what is wrong.... I have 3 files with IP addresses: file1 134.123.3.236 file2 134.123.3.235 file3 134.123.5.237 I type "prob1 Oops x2x3x4". Then my code creates file with name Oops and first line x2x3x4. Moreover, my code generate IP and it gives to file Oops as a second... (8 Replies)
Discussion started by: Manu1234567
8 Replies

4. Shell Programming and Scripting

Wrong output when run via Cron

Hello, This may be a simple one, but i can't see what the issue is. When i run the script via CLI, then i get the correct output via the if statement, but when i run via CRON i get the wrong statement. echo " Checking Job Status" >> $DIR/Bpimagecleanup_$DATE... (3 Replies)
Discussion started by: Junes
3 Replies

5. Shell Programming and Scripting

What is wrong with my perl script?

i managed to write a perl script for nagios. now, the script works. but i think there's somethign wrong with the exit codes. because the script doesn't show the output of the results in nagios, it instead shows null. please tell me what i'm doing wrong here: #!/usr/local/bin/perl use... (2 Replies)
Discussion started by: SkySmart
2 Replies

6. Shell Programming and Scripting

Wrong output in find command

Hi guys - I am trying a small script to tell me if there is a file that exists less than 1k. It should report ERROR, otherwise the check is good. I wrote this script down, however it never runs in the if/then statement. It always returns the echo ERROR. MYSIZE=$(find /home/student/dir1... (8 Replies)
Discussion started by: DallasT
8 Replies

7. Emergency UNIX and Linux Support

getting wrong output with AWK command!!!

i have a file which gets appended with 9 records daily and the file keeps growing from then...i use to store the previous day files count in a variable called oldfilecount and current files count as newfilecount.my requirement is that i need to start processing only the new records from the... (3 Replies)
Discussion started by: ganesh_248
3 Replies

8. Shell Programming and Scripting

wrong output in perl script

Hi, Here is my piece of code-- #!/usr/bin/perl my $Time_Stamp ; my $User_Name; my $Success; my $Failure; my $ErrorCode; my $ErrorMsg; my $logDir = $ARGV; my $logPrefix = $ARGV; die "usage: $0 <logDir> <logPrefix>" unless $logDir and $logPrefix; die "Log dir $logDir doesn't... (2 Replies)
Discussion started by: namishtiwari
2 Replies

9. Shell Programming and Scripting

tr command giving wrong output

Hi All, i have a file which have many fields delimited by ,(comma) now i have to show only few fields and not all. the sample text file looks like this: TYPE=SERVICEEVENT, TIMESTAMP=05/06/2009 11:01:40 PM, HOST=sppwa634, APPLICATION=ASComp, FUNCTION=LimitsService, SOU... (8 Replies)
Discussion started by: usha rao
8 Replies

10. Shell Programming and Scripting

Sort command giving wrong output

Hi all, I have a problem with sort command. i have a file which looks like this: "file1 1073 java/4 1073 java/180 1073 java/170 1073 java/176 1073 java/167 1073 java/40 1073 java/33 1073 java/136 28988 java/76 28988 java/73 28988 java/48 28988 java/26" and i want to sort... (8 Replies)
Discussion started by: usha rao
8 Replies
Login or Register to Ask a Question