ios - float 保留两位小数

Question

比方说3.1415926,我现在想传给后台的是3.14，类型是必须是float类型，该怎么样做？
还有即便通过运算得到了3.14，然后我要是按float传过去，是不是本质上传的还是3.1400000?

Answer 1

It should be possible to use string formatting, because what is received in the background is also a string type, not a float type, just use .2f directly

Answer 2

Why are all strings transmitted from the front to the backend? Float doesn’t have any number of decimal places, or bigdecimal

Answer 3

The double type is more accurate. You can also try the NSDecimalNumber class

Answer 4

Use floor 函数即可：
double re = floor(numFloat*100) / 100;

Answer 5

You can use toFixed(2) to retain two decimal places

Answer 6

.2f is generally acceptable