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test/forcenum.awk
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BEGIN {
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        # make some strnums
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        nf = split("|5apple|NaN|-NaN|+NaN| 6|0x1az|011Q|027", f, "|")
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        for (i = 1; i <= nf; i++) {
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                # NaN values on some systems can come out with
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                # a sign in front of them. So instead of using %g to
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                # convert the strnum to a double, do it manually, and
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                # then remove any leading sign so that the test will
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                # work across systems.
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                val = f[i] + 0
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                val = val ""
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                val = tolower(val)
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                sub(/^[-+]/, "", val)
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                printf "[%s] -> %s (type %s)\n", f[i], val, typeof(f[i])
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        }
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}