如何设置浮点precision一个变量中 [英] How to set floating point precision inside a variable

问题描述

我目前工作的一个程序，我需要一个浮点后，计算一个圆形的值只有2位。
我说，我已经声明

I am currently working a program where I need to calculate a rounded value to only 2 digits after a floating point. Say, I have declared

float a;

如果 A = 3.555 那就存储 A = 3.56 ，围捕。

有关 A = 3.423 的价值将是 A = 3.423 ，没有任何变化。

For a = 3.423, the value of a would be a = 3.423, no change.

我能做到这一点，打印输出，但我需要它存储到一个变量时做的，使用该变量其他一些计算？

I can do this to print output, but what I need to do when storing it into a variable and use that variable for some other calculation?

推荐答案

如果您需要小数点后两位数字，不要使用浮点。使用固定的点数来代替。例如，只需要使用一个整数，它比你想重新present十进制数大100倍。试图将基地2浮点数四舍五入成这样的规则，只是不会产生令人满意的结果给你。

If you need two digits after the decimal point, don't use floating point. Use a fixed point number instead. For example, just use an integer that's 100 times larger than the decimal number you want to represent. Trying to fit a base 2 floating point number into rounding rules like this just isn't going to produce satisfactory results for you.

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