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Perl numeric data types.
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Type Example
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Integer 123
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Floating 1.23
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Scientific 1.23E4
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Hex 0x123
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Octal 0123
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Binary 0b101010
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Underlines 1_234_567
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The underlined formats digits in a number in groups, such as 1,234,567
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$variable1 = 1_234_567;
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