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Java基础语法重点02(类型转换)

类型转换由于Java是强类型语言，所以要进行有些运算的时候，需要用到类型转换类型转换： byte,short,char--->int--->long--->float--->double （低--------------------------------------------------高）运算中，不同类型的数据先转换成同一类型，然后进行运算强制转换：（类型）变量名

Day07

package base;public class Day06 { public static void main(String[] args) { //操作比较大的时候，注意溢出问题 //JDK7新特性，数字之间可以用下划线分割 int money =10_0000_0000; int years =20; int total =money*years;//-1474836480，计算的时候溢出了 l

强制转换

/*1. 不能对布尔值进行转换2.不能吧对象类型转换成不相干的类型3.在把高容量转换到低容量的时候需要强制转换4.转换的时候可能存在内存溢出，或者精度问题（就是小数的时候转成整数int） */System.out.println((int)23.4);System.out.println((int)23.56);System.out.println("=========

MathProblem 83 To confess or not confess problem

You and your partner in crime are both arrested and questioned separately. You are offered a chance to confess, in which you agree to testify against you partner, in exchange for all charges being dropped against you, unless he testifies against you also.

类型转换

public class leixing { public static void main(String[] args) { int i =128; byte a = (byte) i;//内存溢出！ //强制转换（类型）变量名高--低 int b = 129; double c = b; System.out.println(b); System.out

类型转换2

public class Demo05 { public static void main(String[] args) { //操作比较大的时候，注意溢出 //jdk7新特性，数字之间可以用下划线分割 int money = 10_0000_0000; int years = 20; int total = money*years;//-1474836480, 计算的时候溢出

输入年月日，计算这一天是一年的第几天？

#include<stdio.h> int main() { int a[12]={31,28,31,30,31,30,31,31,30,31,30,31}; int num; int years,months,days,i,j=0,flag = 1; scanf("%d-%d-%d",&years,&months,&days); if(years%4==0&&years%100!=0

类型转换

类型转换低------------------------------------>高 byte, short, char, -> int -> long -> float -> double int i = 128;byte b = (byte)i;//内存溢出//强制转换（类型）变量名高--低//自动转换低--高int c = 128;double d = c;System.out.println(c);//12

浅学之溢出问题

public class Demo05 { public static void main(String[] args) { //操作比较大的数的时候注意溢出问题 //JDK新特性，数字之间可以用下划线分隔 int money = 10_0000_0000; System.out.println(money); } } public class Demo05 {

类型转换

一.强制转换 (你想要转换的类型)变量名高--低 int i = 128; System.out.println((short)i); 二.自动转换　　　　　　　　　　　　低--高 int n = 10; double s = n; System.out.println(s); //10.0 三.拓展操作较大的数的时候，注意溢出问题 JDK7新特性，数字之间可以用下

类型转换

int i = 128; double b = 1; System.out.printin(i); sout(b); 强制转换高容量到低容量自动转换低到高注意点： 1.不能转换布尔值 2.不能把对象类型转换为不相干类型 3.在高容量转换为低容量时是强制转换 4.转换时可能出现内存溢出或精度问题 int money = 10_0000_0000; int yea

类型转换

public class Demo04 { public static void main(String[] args){ int i=128; double b=(byte)i; //强制转换（类型）变量名高--低 //自动转换低--高 System.out.println(i); System.out.println(b); /* 注意

golang 方法接收者

[定义]： golang的方法(Method)是一个带有receiver的函数Function，Receiver是一个特定的struct类型，当你将函数Function附加到该receiver，这个方法Method就能获取该receiver的属性和其他方法。 [面向对象]： golang方法Method允许你在类型上定义函数，是一个面向对象的行为代码，这也有一

Instrument: date

+ 号可省略 date +'%F %T' --date='+8 seconds' # 8秒后 date +'%F %T' --date='-8 seconds' # 8秒前 date +'%F %T' --date='+5 minutes' # 5分后 date +'%F %T' --date='-5 minutes

C++学习笔记

C++学习笔记数组的替代选项---模板类vector、array void test11() { unsigned short n = 10; const unsigned short m =10; vector<int> vi; vector<double>vd(n); array<int, 5> ai; //m必须是常量，而不能是变量，可以是一个数值10，或者const unsigned int类型的变量 arra

[JAVA]数字分割

/* ██╗ ███████╗ ██████╗ ███████╗██╗ ██╗██╗ ██║ ██╔════╝██╔═══██╗ ██╔════╝██║ ██║██║ ██║ █████╗ ██║ ██║ ███████╗███████║██║ █

Andrew, 61 years old, and Clare, 59 years old, are a married couple

Andrew, 61 years old, and Clare, 59 years old, are a married couple. They have no children and their parents have died. Both are considering retirement and they want to have a chat with their financial adviser on their retirement options. Both have a High

Your five-year-old daughter has just announced that she would like to attend college

Your five-year-old daughter has just announced that she would like toattend college. The College Board has reported that the average cost oftuition, room, board, and other expenses at public four-year colleges is$18,391 in the 2013–2014 academic year. The

Java语法-类型转换

类型转换由于Java是强类型语言，所以要进行有些运算的时候，需要用到类型转换低---------------------------------------------------->高 byte，short，char，int，long，float，double> 小数的优先级大于整数运算中，不同的类型，转换为同一类型后再运算 // 强制转换：（类型）变量名，高---低 //自

java基础知识类型转换

public class demo5 { public static void main(String[] args) { int i = 128; byte b = (byte) i ;//内存溢出 double c= i; //强制转换（类型）变量名高--低 //自动转换低--高 System.out.println(i); Sys

类型转换

类型转换 Java是强类型语言，进行部分运算时需要使用类型转换不同类型数据先转化为同一类型再进行运算高到低，强制类型转换 (类型)变量名 int i = 128;byte b = (byte)i//内存溢出低到高，自动类型转换(必要时强转亦可) int i = 128;double d = i; 不能对布尔值

Java英语面试自我介绍模板

Good morning.It is really my honor to have this opportunity for this interview.I hope I can make a good performance today!Now , I will introduce myself briefly.I am thirty-four years old. born in Shandong province,I graduated from Shanghai Institute of In

2022-2023年英语周报七年级第26期答案汇总

进入查看： 2022-2023年英语周报七年级第26期答案汇总 In recent years research on infant development has shown that the standard a child is likely to reach， within the range of his inherited[遗传的] abilities， is largely determined in the first three years of hi

The Definitive ANTLR 4 Reference

原文：https://github.com/joaoBordalo/feup-COMP/blob/master/The Definitive ANTLR 4 Reference.pdf ANTLR V4介绍新的解析技术：Adaptive LL() or ALL() 简化对expression的语法表达自动将左递归规则重写为等价的非左递归规则 parse-tree walker: listener and visitor pattern

类型转换的例子

public class Demo05 { public static void main(String[] args) { //操作较大的数时，注意溢出问题 //数字之间用下划线隔开更易于查看 int money = 10_0000_0000; int years = 20; int total = mone