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- #!/usr/bin/env bash
- # File: combination.sh
- # Name: D.Saravanan
- # Date: 05/01/2021
- # Script to calculate combination C(n,r)
- factorial() {
- declare -i value=1
- for ((x = $1; x >= 1; x--)); do
- value=$((value * x))
- done
- return $value
- }
- declare -i n
- declare -i r
- printf "Enter n: "
- read -r n
- printf "Enter r: "
- read -r r
- factorial "$n"
- value1=$?
- factorial "$n"-"$r"
- value2=$?
- factorial "$r"
- value3=$?
- ((combination = value1 / (value2 * value3)))
- printf "Combination C($n,$r): %d\\n" $combination
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