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Re^2: New student, can we write this program in perl...

by rahulraina7 (Initiate)
on Oct 19, 2012 at 16:45 UTC ( #999980=note: print w/ replies, xml ) Need Help??


in reply to Re: New student, can we write this program in perl...
in thread New student, can we write this program in perl...

Thank you Choroba Sir for your interest , please have a look at C code.

#include<stdio.h> #include<conio.h> void main() { int a[20],b[20],c[20],i,j=0,k=0,n; clrscr(); printf("Enter the number of elements"); scanf("%d",&n); printf("Enter n numbers\n"); for(i=0;i<n;i++) { scanf("%d",&a[i]); } for(i=0;i<n;i++) { if((a[i]%2)==0) { b[j]=a[i]; j++; } else { c[k]=a[i]; k++; } } printf("The even numbers are\n"); for(i=0;i<j;i++) { printf("%d\n",b[i]); } printf("The odd numbers are\n"); for(i=0;i<k;i++) { printf("%d\n",c[i]); } getch(); }
It will basically input an array of 'n' numbers and then separate it into two arrays, one contains odd numbers and one contains even numbers. Hoping to hear from you soon.


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Re^3: New student, can we write this program in perl...
by choroba (Abbot) on Oct 19, 2012 at 17:15 UTC
    I would change your program to this one:
    #!/usr/bin/perl use warnings; use strict; print 'Enter the number of elements: '; my $n = <>; # Read the input. chomp $n; # Remove the newline. print "Enter $n numbers.\n"; my @a; for (1 .. $n) { push @a, scalar <>; # Push numbers to the +array. } chomp @a; # Remove the newlines. print join (' ', 'The even numbers are:', grep $_ % 2, @a), # grep filters the num +bers = 1 modulo 2 "\n"; print join (' ', 'The odd numbers are:', grep 1 - $_ % 2, @a), "\n";
    Not really similar, is it? The main differences:
    • No main function needed.
    • Variables are declared where needed.
    • The diamond operator is used to read from the input.
    • for can be used with simpler syntax, avoiding off by 1 errors (see perlsyn)
    • grep can be used to filter arrays. No need for temporary variables to keep the results if you do not need them later.
    لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
Re^3: New student, can we write this program in perl...
by Jenda (Abbot) on Oct 22, 2012 at 23:23 UTC
    use strict; # #include<conio.h> #void main() #{ my (@a,@b,@c,$i,$j,$k,$n); print("Enter the number of elements\n"); $n = <>; printf("Enter %d numbers\n",$n); for($i=0;$i<$n;$i++) { push @a, scalar(<>); } for($i=0;$i<$n;$i++) { if(($a[$i]%2)==0) { $b[$j]=$a[$i]; $j++; } else { $c[$k]=$a[$i]; $k++; } } print("The even numbers are\n"); for($i=0;$i<$j;$i++) { printf("%d\n",$b[$i]); } printf("The odd numbers are\n"); for($i=0;$i<$k;$i++) { printf("%d\n",$c[$i]); } <>; #}

    Not that this was the best (or even just a particularly good) way to write this, but it's the minimal change. Huge difference from the C code, right?

    Jenda
    Enoch was right!
    Enjoy the last years of Rome.

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