Java Applet exercises

/*
* 1. byte byte_n1;
* Short short_n1 = 10;
* Short short_n2;
* Int int_n1 = 3000000;
* Int int_n2, int_n3;
* Long long_n1 = 400;
* Long long_n2, long_n3;
* Byte_n1 = short_n1;
* Byte_n1 = (byte) short_n1;
* Short_n2 = (short) int_n1;
* Int_n2 = int_n1 * short_n1;
* Int_n3 = long_n1 * short_n1;
* Long_n2 = int_n1 * 2000;
* Long_n3 = int_n1 * 2000L;
* 2. Computer Verification
* Public class Example {
* Public static void main (String [] args ){
* Int a = 20, B = 50, c = 100, d;
* A % = 9;
* B/= 7;
* C % = B;
* D = a + B + c;
* System. out. println ("a =" + );
* System. out. println ("B =" + B );
* System. out. println ("c =" + c );
* System. out. println ("d =" + d );
*}
*}
* 3. Write an application that reads three non-zero data input by the user and determines whether the three data output can constitute a triangle.
* 4. Use the switch statement to compile a program that completes the four arithmetic operations of two integers.
* 5. Write an application and calculate the value of 1*1-2*2 + 3*3-4*4 +...-100*100.
* 6. Write an application, and calculate 1! + 2! + ...... + 20! And display, output 1 at the same time! , 2! , 3 !... .
**/
Package ch3;
 
/* Public class Example {
 
Public static void main (String [] args ){
Int a = 20, B = 50, c = 100, d;
A % = 9;
B/= 7;
C % = B;
D = a + B + c;
System. out. println ("a =" + );
System. out. println ("B =" + B );
System. out. println ("c =" + c );
System. out. println ("d =" + d );
}
}*/
/* Import java. util. collections;
* Public class PanDuanSanJiao {
Public static void main (String [] args ){
S = new partition (System. in );
System. out. println ("Enter three integers ");
Int a = s. nextInt ();
Int B = s. nextInt ();
Int c = s. nextInt ();
If (a <0 | B <0 | c <0 ){
System. out. println ("enter a positive number ");
} Else if (a + B> c & a + c> B & B + c> ){
System. out. println ("triangles can be formed ");
}
}
}*/
/* Public class SiZeYunSuan {
Public static void main (String [] args ){
Int a = 10;
Int B = 20;
Char operator = '+ ';
Switch (operator ){
Case '+ ':
System. out. println (a + "+" + B + "=" + (a + B ));
Break;
Case '-':
System. out. println (a + "-" + B + "=" + (a-B ));
Break;
Case '*':
System. out. println (a + "*" + B + "=" + (a * B ));
Break;
Case '/':
System. out. println (a + "/" + B + "=" + (a/B ));
Break;
Default:
System. out. println ("-1 ");
}
}
}*/
/* Public class QiuZhi {
Public static void main (String [] args ){
Int sum = 0;
For (int I = 1; I <= 100; I ++ ){
If (I % 2 = 1 ){
Sum + = I * I;
} Else {
Sum-= I * I;
}
}
System. out. println ("and" + sum );
}
}*/
/* Public class JC {
Public static void main (String [] args ){
Long sum = 0;
Long result = 1;
For (int I = 1; I <= 20; I ++ ){
Result * = I;
System. out. println (the factorial of I + "is:" + result );
Sum + = result;
}
System. out. println ("the factorial sum between 1 and 20 is:" + sum );
}
}*/