/*
Self-increment operator: ++
Self-decrement operator: --
Basic meaning: let the variable load or drop a number 1.
The way to use it: write it before the name of the variable or after the name of the variable. For example, ++i, i--
1) used alone
2) mixed use
Differences in use: 1) When used alone, there is no difference between before ++ and after ++
2) When mixed use
(1) If it is [ Before ++], [then the variable name will immediately +1] and then continue to use the result [add first and then use]
(2) If it is [after ++], then first use the original value of the variable, [then let the variable + 1] [Use first and then add]
Precautions; only variables can be self-added or self-decremented
*/
public class fx{ public static void main(String[] args){ int a=10; ++a;//Front+ + System.out.println(a); a++;//After ++ System.out.println(a); int b=20;//Use with printing, the variable immediately becomes 21, and then prints the result 21 System. out.println(++b);//21
int c=20;// First use the original value of the variable, and then let the variable +1
System.out.println(c++);//20
System.out.println(c);//21
//It is related to the assignment operation Mixed
int d=30;//Mixed use, the former--immediately-1 becomes 29, and then the obtained result 29 is passed to the variable e
int e=--d;
System.out.println(e);//39
System.out.println(d);//39
//Mixed use of
int f=40;//After mixed use -- first hand over the original 40 to g, and then turn -1 into 39
int g=f-- ;
System.out.println(g);//40
System.out.println(f);//39
int num1=10;
int num2=20;
int num3=++num1+num2--;
System.out. println(num1);//11
System.out.println(num2);//19
System.out.println(num3);//31
}
}
