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56 lines
785 B
Bash
56 lines
785 B
Bash
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#!/usr/bin/env bash
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x=10
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if [[ -n $1 ]]; then
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x=$1
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fi
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y=20
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if [[ -n $2 ]]; then
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y=$2
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fi
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echo "x=${x}, y=${y}"
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val=`expr ${x} + ${y}`
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echo "${x} + ${y} = $val"
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val=`expr ${x} - ${y}`
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echo "${x} - ${y} = $val"
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val=`expr ${x} \* ${y}`
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echo "${x} * ${y} = $val"
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val=`expr ${y} / ${x}`
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echo "${y} / ${x} = $val"
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val=`expr ${y} % ${x}`
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echo "${y} % ${x} = $val"
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if [[ ${x} == ${y} ]]; then
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echo "${x} = ${y}"
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fi
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if [[ ${x} != ${y} ]]; then
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echo "${x} != ${y}"
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fi
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# Execute: ./operator-demo.sh
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# Output:
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# x=10, y=20
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# 10 + 20 = 30
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# 10 - 20 = -10
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# 10 * 20 = 200
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# 20 / 10 = 2
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# 20 % 10 = 0
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# 10 != 20
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# Execute: ./operator-demo.sh 10 30
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# Output:
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# x=10, y=30
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# 10 + 30 = 40
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# 10 - 30 = -20
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# 10 * 30 = 300
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# 30 / 10 = 3
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# 30 % 10 = 0
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# 10 不等于 30
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