【who were computers invented by?when were compu】

问题补充：

who were computers invented by?when were computers invented?how were computers invented?what are they used for?

答案：

1942年由法国数学加巴斯卡所发明的巴斯卡机,这台机器是由许多的齿轮与杠杆所组成的.

电脑可以变成一个加法累加器.