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@ -85,7 +85,7 @@ int main() {
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// doubles are usually 64-bit floating-point numbers
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double x_double = 0.0; // real numbers without any suffix are doubles
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// integer types may be unsigned (only positive)
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// integer types may be unsigned (greater than or equal to zero)
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unsigned short ux_short;
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unsigned int ux_int;
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unsigned long long ux_long_long;
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@ -259,6 +259,7 @@ levels(infert$education) # "0-5yrs" "6-11yrs" "12+ yrs"
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# NULL
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# "NULL" is a weird one; use it to "blank out" a vector
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class(NULL) # NULL
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parakeet = c("beak", "feathers", "wings", "eyes")
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parakeet
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# =>
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# [1] "beak" "feathers" "wings" "eyes"
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