1.
è¿éç¨éå½ç®æ³
è¿éæ没æä½ è¯´ä»ä¹ï¼ä¸º0ï¼ä¸ºä»ä¹è¦a-1åå 2ï¼ä¼°è®¡é¢ç®çéäºå§- -
ç¨åºå¦ä¸ï¼
public class First{
public static void main(String[] args) {
int age=10;
for(int i=1;i<5;i++) {
age+=2; //è¿ä¸ªåºè¯¥å¥½ç解çå§ï¼åä¸ä¸ªäººæ¯åä¸ä¸ªäººå¤§2å²
}
System.out.println("第äºä¸ªäººä¸º"+age+"å²");
}
}
2.
è¿é¢ï¼æä¸å¼å§æ³å¤æäº.ç¨çæ¯èåçæ¹æ³ï¼if(n>99999)....if(n>=1000&&n<=99999)...
ç¶åè¾åºå ä½æ°ï¼æååç¨é¤æ³æ±åºä¸ºå个ä½æ°.æå代ç ä¸å¤§å ï¼è¿å®¹æåºé
æè¿éæ个ç¨å符串æ°ç»çæ¹æ³å¾ç®åä¹æ¯è¾å®¹æç解ï¼
import java.util.Scanner;
public class Second {
public static void main(String[] args){
Second tn = new Second();
Scanner s = new Scanner(System.in);
long a = s.nextLong(); //å°è¾å
¥çæ°æ®è½¬å为é¿æ´åï¼
String ss = Long.toString(a);//å°long a转æ¢ä¸ºå符串ss;
char[] ch = ss.toCharArray(); //ç¨.toCharArrayï¼ï¼æ¹æ³å°å符串ss转æ¢ä¸ºå符串æ°ç»ch;
System.out.println(a + "æ¯" + ch.length + "ä½æ°");//è¾åºå符串æ°ç»çé¿åº¦å³è¯¥æ°æ®çä½æ°;
for(int i=ch.length-1; i>=0; i--) { //å符串æ°ç»ä»ch[0] --> ch[ch.length-1],ä¾æ¬¡åå¨äºæ°æ®çå个ä½æ°
System.out.print(ch[i]); //å©ç¨for循ç¯æååºè¾åºå符串æ°ç»å
çæ°æ®ï¼å³è¯¥5ä½æ°çå个ä½æ°
}
}
}
3.å¿å¿ï¼è¿é¢ä¹ç¨å符串æ°ç»æ´ç®åäº
import java.util.Scanner;
public class Third {
public static void main(String[] args)
{
Scanner s = new Scanner(System.in);
System.out.print("请è¾å
¥ä¸ä¸ª5ä½æ£æ´æ°ï¼");
long a = s.nextLong(); //å°è¾å
¥æ°æ®è½¬æ¢ä¸ºlongå a;
String ss = Long.toString(a); //å°a转æ¢ä¸ºå符串ss;
char[] ch = ss.toCharArray(); //æå符串ss转æ¢ä¸ºå符串æ°ç»ch;
if(ch[0]==ch[4]&&ch[1]==ch[3]){ //个ä½ä¸ä¸ä½ç¸åï¼åä½ä¸åä½ç¸å
System.out.println("è¿æ¯ä¸ä¸ªåææ°");
}
else {
System.out.println("è¿ä¸æ¯ä¸ä¸ªåææ°");
}
}
}
è¿éæåªéä¸ç解çQQé讲å§
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