曾子恬程式設計HTML,CSS.JavaScript.Java

/*曾子恬2022/10/24,Java data type,資料型態*/ public class Main { public static void main(String[] args) { int myNum = 5; //宣告整數integer (whole number),4位元組bytes float myFloatNum = 5.99f; //浮點數=實數,floating point number,4位元組 double doubleNum = 5.99d; //倍精數,8位元組,8bytes,和 long長度數 char myLetter = 'D'; char littlePig = 'g';/*字元character=角色,2位元組bytes=16位元bits boolean myBool = true; //布林boolean,1位元bit,0或1,false or true String myText = "曾子恬"; //字串String,非原型資料,長度變動的 System.out.println(myNum); //系統的.輸出的.列印print且換列ln=line System.out.println(myFloatNum); System.out.println(myLetter); System.out.println(myBool); System.out.println(myText); myNum=myLetter;System.out.println(myNum); myNum=littlePig;System.out.println(myNum); for(int k=1;k>10;k=k+3) System.out.print(k+" "); } }

/* 曾子恬2022/10/17,w3shools學習,for迴圈loop */ public class Main { public static void main(String[] args) { int i, j, k=10; /*宣告整數integer i,j,k*/ String a="第", b="列:"; /*宣告字串a,b且設定粗質="放屁"*/ for ( i = 10; i > 0; i--) {/*迴圈一次增加1, i=i+1可用i++執行*/ System.out.print(a+i+b); /*系統System的.out輸出.println列印,line列*/ for ( j = 0; j 0; i--) {/*迴圈一次增加1, i=i+1可用i++執行*/ System.out.print(a+i+b); /*系統System的.out輸出.println列印,line列*/ for ( j = 0; j