<
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$x < 5 returns a value of 1 if the value of $x is less than 5; otherwise returns 0 (zero).
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>
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$x > $y returns a value of 1 if the value of $x is greater than the value of $y; otherwise returns 0 (zero).
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<=
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$x <= $q returns a value of 1 if the value of x is less than or equal to the value of $q; otherwise returns 0 (zero).
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>=
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$x >= 3 returns a value of 1 if the value of $x is greater than or equal to 3; otherwise returns 0 (zero).
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==
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$x == 5 returns a value of 1 if the value of $x is equal to 5; otherwise returns 0 (zero).
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!=
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$s != "string" returns a value of 1 if the value of $s is not “string”; otherwise returns 0 (zero).
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