基本运算与加法电路
- 半加器
- 两个二进制数（A和B）相加，最低位会产生两个结果，分别是和（S）和进位（C）,能够实现一个二进制位加法运算的电路即半加器，半加器可以这样设计门电路（根据A、B相加后的运算结果）：S=A⊕BS=A⊕B,C=ABC=AB
- 全加器
- 将A、B、C一同运算产生S和新的进位C称之为全加器，全加器和半加器统称加法器，全加器相互串联即构成了二进制数的加法运算，常见的8位、16位、32位、64位为CPU的寄存器位数，不要混淆为加法器的个数（也和总线位数有关）。
- 现在一个CPU中含有的加法器个数非常巨大。
- 基本运算的实现（二进制）：
- 减法：由加法计算A和B的补码即为减法
- 乘除法：由移位实现
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Compared with traditional contracts,smart contracts with the three characteristics of blockchain have the following advantages:
1.Trust.
As the smart contract is based on the blockchain,the contract content is open and transparent,and cannot be tampered with.Code is law.Based on the trust of code,traders can trade safely and safely in a distrustful environment.
2.Economical and efficient
Compared with traditional contracts,disputes often arise due to differences in understanding of contract terms;Smart contracts can avoid differences well through computing language,rarely cause disputes,and the cost of reaching consensus is very low.On the smart contract,the arbitration result comes out and takes effect immediately.Therefore,compared with traditional contracts,smart contracts have economic and efficient advantages.
