24 lines
544 B
Bash
24 lines
544 B
Bash
mean() {
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if expr $# >/dev/null; then
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(count=0
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sum=0
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while expr $# \> 0 >/dev/null; do
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sum=`expr $sum + "$1"`
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result=$?
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expr $result \> 1 >/dev/null && exit $result
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count=`expr $count + 1`
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shift
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done
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expr $sum / $count)
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else
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echo 0
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fi
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}
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printf "test 1: "; mean # 0
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printf "test 2: "; mean 300 # 300
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printf "test 3: "; mean 300 100 400 # 266
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printf "test 4: "; mean -400 400 -1300 200 # -275
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printf "test 5: "; mean - # expr: syntax error
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printf "test 6: "; mean 1 2 A 3 # expr: non-numeric argument
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