#!/bin/bash
#for嵌套for循环
#9*9乘法口诀
echo "for的九九乘法表"
for(( i=1 ;i<=9;i++ ))
do
for(( j=1;j<=9;j++ ))
do
#当$j小于等于$i,在屏幕上打印乘法表
[ $j -le $i ] && echo -n "$i*$j=$[ $i * $j ] "
done
echo ''
done
#9*9乘法口诀
# echo "until的九九乘法表"
# a=1
# b=1
# until [ $a -gt 9 ]
# do
# until [ $b -gt 9 ]
# do
# 当$j小于等于$i,在屏幕上打印乘法表
# [ $b -le $a ] && echo -n "$a*$b=$[ $a * $b ] "
# b=$[$b + 1]
# done
# echo ''
# a=$[$a + 1]
# done
#9*9乘法口诀
# echo "while的九九乘法表"
# i=1
# j=1
# while [ $i -lt 10 ]
# do
# while [ $j -lt 10 ]
# do
# 当$j小于等于$i,在屏幕上打印乘法表
# [ $j -le $i ] && echo -n "$i*$j=$[ $i * $j ] "
# j=$[ $j\+1 ]
# done
# echo ''
# i=$[ $i\+1 ]
# done
#9*9乘法口诀
echo "while与for的九九乘法表"
i=1
while [ $i -lt 10 ]
do
for(( j=1;j<=9;j++ ))
do
#当$j小于等于$i,在屏幕上打印乘法表
[ $j -le $i ] && echo -n "$i*$j=$[ $i * $j ] "
done
echo ''
i=$[ $i+1 ]
done
#9*9乘法口诀
echo "until与for的九九乘法表"
i=1
until [ $i -gt 9 ]
do
for(( j=1;j<=9;j++ ))
do
#当$j小于等于$i,在屏幕上打印乘法表
[ $j -le $i ] && echo -n "$i*$j=$[ $i * $j ] "
done
echo ''
i=$[ $i+1 ]
done
#9*9乘法口诀
# echo "until与while的九九乘法表"
# i=1
# j=1
# until [ $i -gt 9 ]
# do
# while [ $j -lt 10 ]
# do
# 当$j小于等于$i,在屏幕上打印乘法表
# [ $j -le $i ] && echo -n "$i*$j=$[ $i * $j ] "
# j=$[ $j+1 ]
# done
# echo ''
# i=$[ $i+1 ]
# done
