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package main

import "fmt"

func main() {
	// Use of the + sign
	//1. Positive value
	var n1 int = +8
	fmt.Println(n1)
	//2. Addition operation
	var n2 int = 6 + 3
	fmt.Println(n2)
	//3. String concatenation
	var n3 string = "a" + "b" + "c"
	fmt.Println(n3)

	// Use of the / sign
	fmt.Println(10 / 3)   // The result of the operation between two int types is an int type
	fmt.Println(10.0 / 3) // The result of the operation involving a floating point type is a floating point type

	// Use of the % sign (also known as modulus) Equivalent formula a%b=a-a/b*b
	fmt.Println(10 % 3)   // 1
	fmt.Println(10 % -3)  // -1
	fmt.Println(-10 % 3)  // -1
	fmt.Println(-10 % -3) // 1

	// Use of the ++ increment and -- decrement operators
	var a int = 10
	a++ // Increment by 1
	fmt.Println(a)
	a-- // Decrement by 1
	fmt.Println(a)
}

package main

import "fmt"

func main() {
	var num1 int = 10
	fmt.Println(num1)
	var num2 int = (10+20)%3*8 - 14 // The right side of the equal sign is evaluated before being assigned to the left side
	fmt.Println(num2)

	var num3 int = 20
	num3 += 20 // Equivalent to num3 = num3 + 20
	fmt.Println(num3)

	// Exercise: Swap the values of two variables (similar to swapping the water in two cups, need to use a third empty cup)
	var a int = 6
	var b int = 9
	var x int
	x = a // Temporarily store the value of a in x, so a is in idle state and the next step can be performed
	a = b // Put the value of b into a, so a takes over the value of b, and b is now in idle state
	b = x // Put the value of x back into b, the value of x is passed from a, so it is equivalent to b taking over the value of a, and the swap of values between a and b is achieved
}

package main

import "fmt"

func main() {
	fmt.Println(1 == 2) // Check if the two sides are equal, return true if they are equal, false if they are not equal
	fmt.Println(1 != 2) // Check if the two sides are not equal, return true if they are not equal, false if they are equal (opposite of ==)
	// Other relational operators are similar, return true if they meet the conditions, false if they do not meet the conditions
}

package main

import "fmt"

func main() {
	// Logical AND: && (true can be understood as true, false can be understood as false,)
	// Both sides must be true for the result to be true, if one side is false, the result is false (one mouse dropping spoils a pot of soup)
	// Characteristics: If the left side is false, the right side does not need to participate in the operation, and the result is false
	fmt.Println(true && true)   // true and true is true, the result is true
	fmt.Println(true && false)  // true and false is false, the result is false
	fmt.Println(false && true)  // false and true is false, the result is false
	fmt.Println(false && false) // false and false is false, the result is false
	// Logical OR: ||
	// Both sides must be false for the result to be false, if one side is true, the result is true
	// Characteristics: If the left side is true, the right side does not need to participate in the operation, and the result is true
	fmt.Println(true && true)   // true and true is true, the result is true
	fmt.Println(true && false)  // true and false is true, the result is true
	fmt.Println(false && true)  // false and true is true, the result is true
	fmt.Println(false && false) // false and false is false, the result is false
	// Logical NOT: ! (takes the opposite result)
	fmt.Println(!true)  // The result is false
	fmt.Println(!false) // The result is true
}

func main() {
	// Functionality: Keyboard input of student age, name, score, and whether they are VIP
	// Method 1: Scanln
	var age int
	fmt.Println("Please enter the student's age:")
	// The purpose of passing the address of the variable is that when the value in the address is changed in the Scanln function, the actual age outside is affected
	fmt.Scanln(&age)
	var name string
	fmt.Println("Please enter the student's name:")
	fmt.Scanln(&name)
	var score float32
	fmt.Println("Please enter the student's score:")
	fmt.Scanln(&score)
	var isVIP bool
	fmt.Println("Please enter whether the student is a VIP:")
	fmt.Scanln(&isVIP)
	fmt.Printf("The student's name is: %v, age is: %v, score is: %v, isVIP: %v", name, age, score, isVIP)
	fmt.Println()
	// Method 2: Scanf
	fmt.Println("Please enter the student's age, name, score, and whether they are VIP, separated by spaces")
	fmt.Scanf("%d %s %f %t", &age, &name, &score, &isVIP)
	fmt.Printf("The student's name is: %v, age is: %v, score is: %v, isVIP: %v", name, age, score, isVIP)
}