Perl :Create binary number and convert it into hex -


i want create binary number given user input. input - array of number output - binary number

binary number should created such have 1 on places has been given input.

in given case input 1, 3, 7 binary no should 1000101 has 1's on 1, 3 , 7 places left.

@x = [ 1, 3, 7 ]; $z = 0; for( $i = 0; $i < 10; $i++ ){     foreach $elem ( @x ){         if( $elem == $i ){             join( "", $z, 1 );         }         else{             join( "", $z, 0 );        }    } } print "value of z: $z";

after execution, getting value of z 0.

i need convert binary hexadecimal.

is there function converts binary hexadecimal?

[ ] creates array , returns reference array, assigning single scalar (poorly named) @x.

you misusing join. use use strict; use warnings qw( );! have caught error.

fixed:

my @bits = ( 1, 3, 7 );  $num = 0; $num |= 1 << $_ @bits;                                            #   76543210 printf("0b%b\n", $num);                    # 0b10001010 printf("0x%x\n", $num);                    # 0x8a

it seems want 0b1000101, need correct indexes.

my @bits_plus_1 = ( 1, 3, 7 );  $num = 0; $num |= 1 << ( $_ - 1 ) @bits_plus_1;                                            #   6543210 printf("0b%b\n", $num);                    # 0b1000101 printf("0x%x\n", $num);                    # 0x45

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