一道JAVA题：试读入一个16位的长整型，利用switch语句计算0—9这十个数字中，每个字出现的次数？ 在Java语言中怎样给一个长整型数保留两位?
\u8bd5\u8bfb\u5165\u4e00\u4e2a16\u4f4d\u7684\u957f\u6574\u578b\uff0c\u5229\u7528switch\u8bed\u53e5\u8ba1\u7b970\u20149\u8fd9\u5341\u4e2a\u6570\u5b57\u4e2d\uff0c\u6bcf\u4e2a\u5b57\u51fa\u73b0\u7684\u6b21\u6570#include
main(){
int a[10],i;
long x;
scanf("%ld",&x);
for (i=0;i<=9;i++) a[i]=0;
while(x)
{
a[x%10]++;
x/=10;
}
for (i=0;i<=9;i++) printf("%d:%d\n",i,a[i]);
}
\u8c03\u8bd5\u901a\u8fc7\uff0c\u8fd0\u884c\u6b63\u786e
double result;
long i= 1000000;
result=(i*100/1024)/(double)100;
\u957f\u6574\u578b\u6570\u6ca1\u6709\u5c0f\u6570\u4f4d\uff0c\u8981\u4fdd\u7559\u5c0f\u6570\u53ea\u80fd\u628a\u7ed3\u679c\u4fdd\u5b58\u5728double\uff08/float\uff09\u578b\u6570\u4e2d\u2026\u2026
具体实现：
文件名：CountNum.java
import java.util.Scanner;
public class CountNum {
public static void main(String[] args){
System.out.println("请输入一个16位数字");
Scanner sc = new Scanner(System.in);
long l = sc.nextLong();
String s = l+"";
char[] ca = new char[16];
s.getChars(0, s.length(), ca, 0);
int[] ia = new int[10];
for(int i=0;i<ca.length;i++){
switch(ca[i]){
case '0': ia[0]++;break;
case '1': ia[1]++;break;
case '2': ia[2]++;break;
case '3': ia[3]++;break;
case '4': ia[4]++;break;
case '5': ia[5]++;break;
case '6': ia[6]++;break;
case '7': ia[7]++;break;
case '8': ia[8]++;break;
case '9': ia[9]++;break;
}
}
System.out.println("统计结果是：");
for(int i=0;i<ia.length;i++){
System.out.println("数字"+i+"出现了"+ia[i]+"次。");
}
}
}
foreach(int i in 16位长整型){
switch（i）{
case 0：
。。。。。
}
}
大概思路就是这样的了。具体怎么实现自己想想吧。因为涉及变量太多，没时间
public static void main(String[] args) {
Scanner sca = new Scanner(System.in);
long l = sca.nextLong();
int[] ints = new int[10];
String str = l + "";
for (char c : str.toCharArray()) {
ints[(int) c - 48]++;
}
for (int i = 0; i < 10; i++) {
System.out.println(i + "出现的次数为:" + ints[i]);
}
}
绛旓細import java.util.Scanner;public class CountNum { public static void main(String[] args){ System.out.println("璇疯緭鍏涓涓16浣嶆暟瀛");Scanner sc = new Scanner(System.in);long l = sc.nextLong();String s = l+"";char[] ca = new char[16];s.getChars(0, s.length(), ca, ...
绛旓細long m = sc.nextLong();鍖锛歫ava.util.Scanner 绠鍗曞湴 import java.util.Scanner;class DigitCounter{ public static void main(String args[]) throws Exception{ System.out.println("璇疯緭鍏鍗佸叚浣嶉暱鏁村瀷鏁癿: ");Scanner sc = new Scanner(System.in);long m = sc.nextLong();String str =...
绛旓細鍙互閫氳繃鈥漇canner鈥滃嚱鏁 鐩存帴杈撳叆鍙傛暟鐨勫舰寮忥紝鏉ュ疄鐜拌緭鍏ヨ鍙ワ紝涓句緥锛歩mport java.util.Scanner;public class Test { public static void main(String[] args) { Scanner input=new Scanner(System.in);System.out.println("璇疯緭鍏涓涓鏁存暟锛");int length=input.nextInt();//杈撳叆涓涓暣鏁 System.o...
绛旓細author 浣犲ソqiulinhe / public class Ceshi { public static void main(String[] args) { Scanner scanner = new Scanner(System.in);System.out.println("璇蜂緷娆¤緭鍏1-10鐨勬暟瀛");for(int i=1;i<11;i++){ int ceshi = scanner.nextInt();switch (ceshi) { case 1:System.out.println...
绛旓細绗簩涓弬鏁颁负甯冨皵鍊,鎺у埗姣忔杈撳嚭鎹㈣绗︽椂java鏄惁鍒锋柊杈撳嚭娴併傚叓.瀛楃娴佺殑璇诲彇鍜屽啓鍏ava.io.Reader 鍜 java.io.InputStream 缁勬垚浜 Java 杈撳叆绫汇俁eader 鐢ㄤ簬璇诲叆16浣嶅瓧绗,涔熷氨鏄 Unicode 缂栫爜鐨勫瓧绗;鑰 InputStream 鐢ㄤ簬璇诲叆 ASCII 瀛楃鍜屼簩杩涘埗鏁版嵁銆俁eader鐨勪綋绯荤粨鏋(1) FileReaderFileReader涓昏鐢ㄦ潵璇诲彇瀛楃...
绛旓細import java.io.*;public class Student { private String name;//鍒涘缓涓涓瀛︾敓绫伙紝灞炴ф湁鍚嶅瓧锛屾у埆锛屽勾榫 private String sex;private int age;Student(String name,String sex,int age){//鎴戜滑鍦ㄥ垱寤哄璞＄殑鏃跺欑洿鎺ョ粰浠栬捣鍚嶅瓧锛屾у埆锛屽勾榫 this.name = name;this.sex = sex;this.age = age;}...
绛旓細import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.ArrayList;import javax.swing.ButtonGroup;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JRadioButton;import javax.swing....
绛旓細Java绋嬪簭锛歩mport java.util.Random; public class HardWork { public static void main(String[] args) { RandomEX rand = new RandomEX(); int n = 4; int group = 10; for(int i=0; i<group; i++) { System.out.printf("绗 %2d 缁勶細\n", i + 1); ...
绛旓細绛旀鏄:鎺ュ彛鏄竴绉嶇壒娈婄殑鎶借薄绫.杩欑鎶借薄绫讳腑鍙寘鍚父閲忓拰鏂规硶鐨勫畾涔,鑰屾病鏈夊彉閲忓拰鏂规硶鐨勫疄鐜.8銆佸畾涔涓涓鏁扮粍鍚庝负浠涔堜笉鑳界珛鍗宠繘琛岃闂紵绛旀鏄:鍒涘缓涓涓暟缁勫悗闇瑕佸垎閰嶇┖闂.褰撶┖闂村垎閰嶅悗鎵嶅彲浠ュ紩鐢ㄦ暟缁勪腑鐨勫厓绱.9銆佸瓧绗︽祦涓庡瓧鑺傛祦鐨勫尯鍒槸锛 锛夈 C A 姣忔璇诲叆鐨勫瓧鑺傛暟涓嶅悓 B鍓嶈呭甫鏈夌紦鍐诧紝鍚庤...
绛旓細16锛Java婧愮▼搴忔槸鐢辩被瀹氫箟缁勬垚鐨勶紝姣忎釜绋嬪簭鍙互瀹氫箟鑻ュ共涓被锛屼絾鍙湁涓涓被鏄富绫汇(瀵)17锛庡湪杩涜绫荤殑缁ф壙鏃讹紝瀛愮被涓嶈兘鎷ユ湁涓庣埗绫荤浉鍚屽悕瀛楃殑灞炴у拰鏂规硶銆(閿)18锛嶴ystem绫讳笉鑳藉疄渚嬪寲锛屽嵆涓嶈兘鍒涘缓System绫荤殑瀵硅薄銆(瀵)19锛庝竴涓被鍙兘鏈変竴涓鐖剁被锛屼絾涓涓帴鍙ｅ彲浠ユ湁涓涓互涓婄殑鐖舵帴鍙ｃ(瀵)20锛...
