Considerations for the IF statement:

Considerations for the IF statement:

A: Comparing expressions whether simple or complex, the result must be a Boolean type

B:IF Statement Control Statement Body if it is a statement, curly braces can be omitted;

If it is more than one statement, you cannot omit it. Never omit the suggestion.

C: Generally speaking: there is no semicolon on the left curly brace, there is no left brace for the semicolon

Class Ifdemo {

public static void Main (string[] args) {

int x = 20;

if (x = = 20) {

System.out.println ("x equals 10");

}

if ((x > 5) | | (x = = 20)) {

System.out.println ("x is greater than or equal to 10");

}

System.out.println ("-------------------");

int a = 100;

/*

if (a = = 100) {

System.out.println (the value of "A is 100");

}

*/

if (A! = 100) {

System.out.println (the value of "A is 100");

System.out.println ("over");

}

System.out.println ("-------------------");

int b = 100;

if (b! = 100); Here is actually a statement body, but is an empty statement body.

code block

{

System.out.println (the value of "B is 100");

System.out.println ("over");

}

}

}

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Considerations for the IF statement: