GAWK: Effective AWK Programming

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158 GAWK: Effective AWK Programming}for (i in vec) {if (ret == "" || vec[i] > ret)ret = vec[i]}return retYou call maxelt with one argument, which is an array name. The local variables i and retare not intended to be arguments; while there is nothing to stop you from passing morethan one argument to maxelt, the results would be strange. The extra space before i in thefunction parameter list indicates that i and ret are not supposed to be arguments. Youshould follow this convention when defining functions.The following program uses the maxelt function. It loads an array, calls maxelt, andthen reports the maximum number in that array:function maxelt(vec, i, ret){for (i in vec) {if (ret == "" || vec[i] > ret)ret = vec[i]}return ret}# Load all fields of each record into nums.{for(i = 1; i
Chapter 8: Functions 159}BEGIN {b = 1foo(b)# invalid: fatal type mismatchfoo(x) # x uninitialized, becomes an array dynamicallyx = 1 # now not allowed, runtime error}Usually, such things aren’t a big issue, but it’s worth being aware of them.
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GAWK: Effective AWK Programming

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