Bash编程代码实例061-065

#!/bin/bash
#【程序61】
#题目：打印出杨辉三角形（要求打印出10行如下图）　　　
#1.程序分析：

a=()
for i in {0..9};do
    for j in {0..9};do
        a[$((i*10 + j))]=0
    done
done

for i in {0..9};do
    a[$((i*10))]=1
    a[$((i*10 + i))]=1
done

for i in {2..9};do
    for j in $(seq 1 $((i - 1)) );do
        a[$((i*10 + j))]=$((${a[$(( (i - 1)*10 + j -1))]} + ${a[$(( (i - 1)*10 + j))]}))
    done
done

for i in {0..9};do
    for j in {0..9};do
       if [ $j -gt $i ];then break;fi
       echo -n "${a[$((i * 10 + j))]}   "
    done
    echo
done