java整数除以整数(java中整数除以小数)
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本文目录一览:
- 1、java中BigDecimal如何实现整除功能?求代码
- 2、java除以一个数,能整除直接取商,如不能整除则只取整数部分,怎么操作?
- 3、求java中整除函数是什么
- 4、java一个整数除以一个小数为什么的到小数
- 5、JAVA里 一个int 数 除以 另一个 int数,比如 101/2 。程序里返回值为
- 6、java除以一个数,能整除直接取商,如不能整除则只取整数部分,记得api里有方法能直接实现,哪位请告知?
java中BigDecimal如何实现整除功能?求代码
不知道你所谓的整除功能是什么意思,如果是整数除以整数最终得到整数的话是这样的:
System.out.println(new BigDecimal(5).divideToIntegralValue(new BigDecimal(4)));
如果还有什么不明白的建议你自己查找BigDecimal的API文档
java除以一个数,能整除直接取商,如不能整除则只取整数部分,怎么操作?
int cc = (int)Math.ceil(998/10);//向下
int cc = (int)Math.floor(997/10);//向上
Java由四方面组成:
1.Java编程语言,即语法。
2.Java文件格式,即各种文件夹、文件的后缀。
3.Java虚拟机(JVM),即处理*.class文件的解释器。
4.Java应用程序接口(Java API)。
Java分为三个体系:
1.Java SE(J2SE,Java2 Platform Standard Edition,标准版),
2.JavaEE(J2EE,Java 2 Platform, Enterprise Edition,企业版),
3.Java ME(J2ME,Java 2 Platform Micro Edition,微型版)。

求java中整除函数是什么
在java中整除的话直接用"/"就可以啦。
求余数则用的是"%"。
要注意的是=号两边的变量类型应该一致哦
java一个整数除以一个小数为什么的到小数
Java中如果除运算符“/”,在不加任何限制的情况下,两个整数相除,得到的是整数,小数点后的被舍弃。但是有些场景下我们需要拿到除得的小数,还要指定位数的小数。这时候有以下处理方法:
1.使用DecimalFormat来限定得到的小数位数
int pcm = 98;
int fcm = 11;
DecimalFormat df = new DecimalFormat("0.00");
double tmpVal = Double.parseDouble(df.format((double) pcm/(pcm+fcm)));
//get value 0.89
注意,它默认返回的是String,如果需要double/float要做一下转换。
2.直接使用Decimal运算
@Test
public void testDecimalOper(){
int pcm = 94;
int fcm = 11;
BigDecimal pcmbd = new BigDecimal(pcm);
BigDecimal fcmbd = new BigDecimal(fcm);
BigDecimal rate = new BigDecimal(0.00);
rate = pcmbd.divide(pcmbd.add(fcmbd), 2, RoundingMode.HALF_UP);
System.out.println(rate);//0.90
}
float/double在工程运算中使用的比较多,在商业计算中使用Decimal类型的比较多。(注:
在《Effective Java》这本书中也提到这个原则,float和double只能用来做科学计算或者是工程计算,在商业计算中我们要用 java.math.BigDecimal,另外,我们如果需要精确计算,要用String来够造BigDecimal。在《Effective Java》一书中的例子是用String来够造BigDecimal的。(注意:divide方法中推荐使用枚举RoundingMode.HALF_UP)
)
两种方式都可以。推荐使用第二种方式来处理精度和round mode的设置。
附BigDecimal rouding mode:
/**
* Rounding mode to round away from zero. Always increments the
* digit prior to a nonzero discarded fraction. Note that this rounding
* mode never decreases the magnitude of the calculated value.
*/
public final static int ROUND_UP = 0;
/**
* Rounding mode to round towards zero. Never increments the digit
* prior to a discarded fraction (i.e., truncates). Note that this
* rounding mode never increases the magnitude of the calculated value.
*/
public final static int ROUND_DOWN = 1;
/**
* Rounding mode to round towards positive infinity. If the
* {@code BigDecimal} is positive, behaves as for
* {@code ROUND_UP}; if negative, behaves as for
* {@code ROUND_DOWN}. Note that this rounding mode never
* decreases the calculated value.
*/
public final static int ROUND_CEILING = 2;
/**
* Rounding mode to round towards negative infinity. If the
* {@code BigDecimal} is positive, behave as for
* {@code ROUND_DOWN}; if negative, behave as for
* {@code ROUND_UP}. Note that this rounding mode never
* increases the calculated value.
*/
public final static int ROUND_FLOOR = 3;
/**
* Rounding mode to round towards {@literal "nearest neighbor"}
* unless both neighbors are equidistant, in which case round up.
* Behaves as for {@code ROUND_UP} if the discarded fraction is
* ≥ 0.5; otherwise, behaves as for {@code ROUND_DOWN}. Note
* that this is the rounding mode that most of us were taught in
* grade school.
*/
public final static int ROUND_HALF_UP = 4;
/**
* Rounding mode to round towards {@literal "nearest neighbor"}
* unless both neighbors are equidistant, in which case round
* down. Behaves as for {@code ROUND_UP} if the discarded
* fraction is {@literal } 0.5; otherwise, behaves as for
* {@code ROUND_DOWN}.
*/
public final static int ROUND_HALF_DOWN = 5;
/**
* Rounding mode to round towards the {@literal "nearest neighbor"}
* unless both neighbors are equidistant, in which case, round
* towards the even neighbor. Behaves as for
* {@code ROUND_HALF_UP} if the digit to the left of the
* discarded fraction is odd; behaves as for
* {@code ROUND_HALF_DOWN} if it's even. Note that this is the
* rounding mode that minimizes cumulative error when applied
* repeatedly over a sequence of calculations.
*/
public final static int ROUND_HALF_EVEN = 6;
/**
* Rounding mode to assert that the requested operation has an exact
* result, hence no rounding is necessary. If this rounding mode is
* specified on an operation that yields an inexact result, an
* {@code ArithmeticException} is thrown.
*/
public final static int ROUND_UNNECESSARY = 7;
JAVA里 一个int 数 除以 另一个 int数,比如 101/2 。程序里返回值为
默认的 Java / 对于两个整数来说返回的也是整数,你可以写成 ((double) 101) / 2 或者 101 * 1.0 / 2.
java除以一个数,能整除直接取商,如不能整除则只取整数部分,记得api里有方法能直接实现,哪位请告知?
int cc = (int)Math.ceil(998/10);//向下
int cc = (int)Math.floor(997/10);//向上
Java由四方面组成:
1.Java编程语言,即语法。
2.Java文件格式,即各种文件夹、文件的后缀。
3.Java虚拟机(JVM),即处理*.class文件的解释器。
4.Java应用程序接口(Java API)。
Java分为三个体系:
1.Java SE(J2SE,Java2 Platform Standard Edition,标准版),
2.JavaEE(J2EE,Java 2 Platform, Enterprise Edition,企业版),
3.Java ME(J2ME,Java 2 Platform Micro Edition,微型版)。
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