代码1:
#!/bin/bash
n=0
i=1
while [ $i -le 30 ]
do
((n=n+i))
((i=i+1))
done
echo "sum=$n"
exit 0
运行结果:
代码2:
#!/bin/bash
n=0
i=1
while [ $i -le 30 ]
do
n="expr $n+$i"
i="expr $i=$i+1"
done
echo "sum=$n"
exit 0
运行出错
代码1:
#!/bin/bash
n=0
i=1
while [ $i -le 30 ]
do
((n=n+i))
((i=i+1))
done
echo "sum=$n"
exit 0
运行结果:
代码2:
#!/bin/bash
n=0
i=1
while [ $i -le 30 ]
do
n="expr $n+$i"
i="expr $i=$i+1"
done
echo "sum=$n"
exit 0
运行出错