java 字串運用範例

public class Ch2_3 {
public static void main(String[] args) {
     // 整數變數宣告
System.out.println("負號運算:-7    = " + -7 );
     System.out.println("乘法運算:5 * 6 = " + 5*6);
     System.out.println("除法運算:7.0/2.0 = " +7.0/2.0);
     System.out.println("餘數運算:7 % 2 = " + 7%2);
     System.out.println("加法運算:4 + 3 = " + (4+3));
     System.out.println("減法運算:4 - 3 = " + (4-3));
     // 字串連接運算子
     String str1 = "Java是";
     String str2 = "一種物件導向程式語言";
     System.out.println("字串連接: " + (str1 + str2));
     int x, y, f, c;  // 變數宣告
     x = 6;  y = 3;
     f = x*x-2*x+3;   // 數學公式
     System.out.println("x*x-2*x+3 = " + f);
     f = (x+y)*(x+y)+5;
     System.out.println("(x+y)*(x+y)+5 = " + f);
     c = 80;
     System.out.print("攝氏: " + c + "度= 華氏: ");
     System.out.println((9.0 * c) / 5.0 + 32.0);
  }

}
=====Result====
負號運算:-7    = -7
乘法運算:5 * 6 = 30
除法運算:7.0/2.0 = 3.5
餘數運算:7 % 2 = 1
加法運算:4 + 3 = 7
減法運算:4 - 3 = 1
字串連接: Java是一種物件導向程式語言
x*x-2*x+3 = 27
(x+y)*(x+y)+5 = 86
攝氏: 80度= 華氏: 176.0

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