可以从右向左逐位取数进行转换:
1 × 2 ^ 0 = 1
0 × 2 ^ 1 = 0
1 × 2 ^ 2 = 4
0 × 2 ^ 3 = 0
1 × 2 ^ 4 = 16
0 × 2 ^ 5 = 0
1 × 2 ^ 6 = 64
最后把各数相加即可:
1 + 4 + 16 + 64 = 85
其他进制转换为十进制也是同样原理,比如八进制的 7654:
4 × 8 ^ 0 = 4
5 × 8 ^ 1 = 40
6 × 8 ^ 2 = 384
7 × 8 ^ 3 = 3584
4 + 40 + 384 + 3584 = 4012