package baitap20; import java.util.Scanner; public class java20 { public static void main(String[] args) {//vidu1();//vidu4();//vd2();//vd3();//vd5(); vidu6 ();} public static void vidu1() {Scanner sc\= new Scanner(System. in );System. out .print("nhap dtb"); double dtb\=sc.nextDouble(); String kq\=(dtb\>5.0)?"dau":"rot"; String xeploai; if (dtb\>=9) {xeploai\="xuat sac"; } else if (dtb\>=7) {xeploai\="kha gioi"; } else if (dtb\>5) {xeploai\="tb"; } else {xeploai\="yeu"; }System. out .println("dtb\n"+xeploai); System. out .println("xep loai\n"+kq); } public static void vd2(){ Scanner sc \= new Scanner(System. in ); double a \= 6, b \= 3;  if (a!=0){ double x \= -b/a; System. out .println("x = "+x); } else { if ( b \== 0){ System. out .println("pTVSN"); } else { System. out .println("PTVN"); } } } public static void vd3(){ Scanner sc \= new Scanner(System. in ); System. out .print("Nhap ngay: "); int Wday \= sc.nextInt(); switch (Wday){ case 2: System. out .println("Monday - firts day"); break ; case 3,4,5,6: System. out .println("Woking day"); break ; case 7,8: System. out .println("Monday - firts day"); break ; } } public static void vidu4() {Scanner sc\= new Scanner(System. in );System. out .println("nhap a"); int a\=sc.nextInt(); System. out .println("nhap b"); int b\=sc.nextInt(); double ketqua; char c;System. out .println("nhap toán tử: +, -, *, /");c\=sc.next().charAt(0); switch (c) { case '+':ketqua \= a + b; System. out .println(a + " + " + b + " = " + ketqua); break ; case '-':ketqua \= a - b; System. out .println(a + " - " + b + " = " + ketqua); break ; case '*':ketqua \= a * b; System. out .println(a + " * " + b + " = " + ketqua); break ; case '/':ketqua \= a / b; System. out .println(a + " / " + b + " = " + ketqua); break ; default : System. out .println("Nhap sai"); break ;}} |
