Question

Linux的shell编程求两个数之和。。急求

Answer 1

#!/bin/bash
echo -n "Enter the first num:"
read first
echo -n "Enter the second num:"
read second
sum=$(echo $first+$second|bc)
echo "$first+$second=$sum"

测试没问题！touch 一个文件，然后vi它，直接vi也可以，然后插入，复制粘贴，保存退出，更改权限，就可以执行了。

Answer 2

#!/bin/bash
echo -n "Enter the first num:"
read first
echo -n "Enter the second num:"
read second
sum=$(echo $first+$second|bc)
echo "$first+$second=$sum"

Answer 3

如果运动过程中，摩擦力消失，如果没有其他阻力阻碍汽车运动，那么汽车会在惯性状态下一直保持原来的状态。

Answer 4

#!/bin/bash
num 1 = 26
num 2 = 89
sum = exper $num 1 + $num 2
echo "the sum is $sum"