package examples;
public class Operations {
public static void main(String args[]) {
parenthesesDemo();
memberSelectionDemo();
separationDemo();
postIncrementDemo();
postDecrementDemo();
preIncrementDemo();
preDecrementDemo();
plusDemo();
minusDemo();
multiplicationDemo();
divisionDemo();
modulusDemo();
additionDemo();
subtractionDemo();
equalsDemo();
plusEqualsDemo();
minusEqualsDemo();
multiplyEqualsDemo();
divideEqualsDemo();
modulusEqualsDemo();
}
public static void parenthesesDemo() {
int x = 4, y = 2, z = 1;
hr();
print("x = 4, y = 2, and z = 1"
+ "\nso when you calculate "
+ "x * (y + z)"
+ "the result is "
+ (x * (y + z)));
print("x = 4, y = 2, and z = 1"
+ "\nso when you calculate"
+ " (x * y) + z the result is "
+ ((x * y) + z));
}
public static void memberSelectionDemo() {
int x = 0;
hr();
print("if we call Math.cos(x) when x = 0 "
+ "using the member"
+ "selection\nwe can "
+ "invoke method "
+ "cos of the Math class, "
+ "the result is "
+ Math.cos(x));
}
public static void separationDemo() {
int x = 4, y = 2;
hr();
print("if we call Math.pow(x,y) "
+ "when x = 4 "
+ "and y = 2 using the "
+ "separation"
+ "\nwe can invoke method "
+ "pow of the Math class,"
+ "the result is " + Math.pow(x, y));
}
public static void plusDemo() {
int x = 4;
hr();
print("x = 4 but +x = "
+ (+x));
}
public static void minusDemo() {
int x = 4;
hr();
print("x = 4 but -x = "
+ (-x));
}
public static void postIncrementDemo() {
int x = 0;
hr();
print("x = 0 but x++ = "
+ x++);
print("after x++, x = "
+ x);
}
public static void postDecrementDemo() {
int x = 0;
hr();
print("x = 0 but x-- = "
+ x--);
print("after x--, x = "
+ x);
}
public static void preIncrementDemo() {
int x = 0;
hr();
print("x = 0 but ++x = "
+ ++x);
print("after ++x, x = "
+ x);
}
public static void preDecrementDemo() {
int x = 0;
hr();
print("x = 0 but --x = "
+ --x);
print("after --x, x = "
+ x);
}
public static void additionDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2"
+ "\nso x + y = "
+ (x + y));
}
public static void subtractionDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2"
+ "\nso x - y = "
+ (x - y));
}
public static void multiplicationDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2\nso x * y = "
+ (x * y));
}
public static void divisionDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2\nso x / y = "
+ (x / y));
}
public static void modulusDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2"
+ "\nso x % y = " + (x % y));
}
public static void equalsDemo() {
int x = 4, y = 2;
hr();
print("x = 4, y = 2\nso x = y "
+ "makes x equal to "
+ (x = y));
}
public static void plusEqualsDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2\nso x += y makes"
+ "x equal to " + (x += y));
}
public static void minusEqualsDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2"
+ "\nso x -= y "
+ "makes x equal to "
+ (x -= y));
}
public static void multiplyEqualsDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2"
+ "\nso x *= y makes "
+ "x equal to "
+ (x *= y));
}
public static void divideEqualsDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2"
+ "\nso x /= y makes x equal to "
+ (x /= y));
}
public static void modulusEqualsDemo() {
int x = 4, y = 2;
hr();
print("x = 4 and y = 2\n"
+ "so x %= y makes x equal to "
+ (x %= y));
}
public static void hr() {
print("____________________________");
}
public static void print(Object o) {
System.out.println(o);
}
}