17 lines
418 B
Bash
17 lines
418 B
Bash
#!/bin/bash
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#Program:
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# 输入一个值，计算从0到这个值的所有和，比如：输入100，那么输出5050
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num=0
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sum=0
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if [ -n "$1" ] && echo "$1" | grep -Eq "^[-+]?[0-9]+$" && [ "$1" -ge 0 ];then
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while [ "$num" -le "$1" ]
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do
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sum=$(($num+$sum))
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num=$((num+1))
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done
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echo "1-${1}求和的结果为：${sum}"
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else
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echo "输入的数值不正确，必须为非空且大与等于0的整数"
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fi |