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【笔记】Dart 浮点数运算
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Dart 浮点数运算学习笔记
整数与整数的相除运算
整数相除得到整数（整除）
- 无论小数位的结果是什么都会被舍弃
double num = 1~/2;
print(num);
0
整数相除得到浮点数
double num = 1/2;
print(num);
0.5
- 当一个小数的小数位不为 0 时，无论小数位的结果是什么，都会向上取整
double num = 0.5;
double res = num.ceilToDouble();
print(res);
1.0
- 当一个小数的小数位为 0 时，不会向上取整
double num = 1.0;
double res = num.ceilToDouble();
print(res);
1.0
- 当一个小数的小数位不为 0 时，无论小数位的结果是什么，都会向上取整
double num = 0.5;
int res = num.ceil();
print(res);
- 当一个小数的小数位为 0 时，不会向上取整
double num = 1.0;
int res = num.ceil();
print(res);
- 当一个小数的小数位不为 0 时，无论小数位的结果是什么，都会向下取整
double num = 0.5;
double res = num.truncateToDouble();
print(res);
0.0
- 当一个小数的小数位为 0 时，不会向下取整
double num = 1.0;
double res = num.truncateToDouble();
print(res);
1.0
- 当一个小数的小数位不为 0 时，无论小数位的结果是什么，都会向下取整
double num = 0.5;
int res = num.truncate();
print(res);
0
- 当一个小数的小数位为 0 时，不会向下取整
double num = 1.0;
int res = num.truncate();
print(res);
double num = 1.4;
int res = num.round();
print(res);
double num = 1.5;
int res = num.round();
print(res);
2
保留指定位的小数
double num = 0.333;
String res = num.toStringAsFixed(2);
print(res);
0.33
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