Hey if we have to print only those regions of range which shows count of C more than 50 then what we have to include in this code written above ????

Your question tells you everything you need to know: 

    if( $counts{ C } > 50 ) {
        printf "range: %d .. %d A:%d C:%d G:%d T:%d\n", 
            $offset, $offset+199, @counts{ qw[ A C G T ] };
    }

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In reply to Re^3: how to access elements in perl by BrowserUk
in thread how to access elements in perl by grewal7634

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