Linux下用shell完成高斯求和

Question

在Linux下用shell高斯求和，求告知怎么写

Answer 1

#/usr/bin/sh

n=$1

sum=0

# 方法1  循环

for i in $(seq 1 $n); do

    ((sum = $sum + $i))

done

echo $sum

# 方法2  公式

((sum=(1 + $n) * $n / 2))

echo $sum

Answer 2

#!/bin/bash

read -p "Input value of n: " n

sum=0

i=1

while (($i<=$n))

do

sum=$(($sum +$i))

i=$(($i+1))

done

echo "SUM is $sum."