2.2 Decimals

2.2 小数 Decimals

单精度浮点数 float

float a = 1.0;

双精度浮点数 double

double a2 = 2.0;

##注意事项 1使用var来定义小数的时候，类型默认为双精度浮点数；
2根据IEEE 754 浮点数计算标准，小数在原生计算时由分数表示，这会造成浮点数精度问题：0.1 + 0.2 不等于 0.3 而是0.30000000000000004
3浮点数在数值为 NaN （Not a number）的情况下会出现一系列问题，请不要让它这么计算。
4当小数参加运算时，最终结果的类型会自动提升。
5当你尝试使用null+1.0时，脚本会报错（java.lang.NullPointerException）
6无限精度的四则运算函数将会在函数章节提及。
7本DSL不建议直接比较纯小数的大小。
1 When using var to define decimals, the default type is double-precision floating-point number.
2 According to the IEEE 754 floating-point calculation standard, decimals are represented by fractions during native calculations, which causes floating-point precision issues: 0.1 + 0.2 does not equal 0.3, but 0.30000000000000004.
3 A series of problems will occur when the floating-point number has a value of NaN (Not a number). Please do not let it perform such calculations.
4 When decimals participate in operations, the type of the final result will be automatically promoted.
5 When you try to use null + 1.0, the script will report an error (java.lang.NullPointerException).
6 The four arithmetic operation functions with infinite precision will be mentioned in the function section.
7 It is not recommended to directly compare the magnitudes of pure decimals in this DSL.