If statement a method that makes a variable or some other type of data to make a decision. For example, you may have a
Script to check if the Boolean value is True or FALSE, or the variable contains a number or string value.
Use the IF statement
Conditional statement, which is a kind of statement that chooses to execute according to the condition in the program, the difficulty lies in how to abstract the condition accurately in the actual use of such statement. For example, to implement the
In the shell of Linux
The IF statement determines which branch to execute through the relational operator to determine the true or false of an expression. The Shell has three kinds of if ... else statements:
If ... fi statement;
if ... else .
Tag: The code implementation has one fill highlight than the multi-label roundSometimes the programming for a long time, if you stop to think about it, even some of the most basic knowledge points, it may also make their own circle. In fact, at the
Java Branching Structure-if...else/switchSequential structures can only be executed sequentially, not judged and chosen, so branching structures are required.There are two types of branching structures in Java:
if statement
Switch
First, If...else statement
If...else statement
Executes a piece of code when the condition is set, and executes another piece of code when the condition is not established
Grammar:
1. Simple condition
if (condition) {......}else{......}
Cases
First, If...else statement
If...else statement
Executes a piece of code when the condition is set, and executes another piece of code when the condition is not established
Grammar:
1. Simple condition
if (condition) {
......
}
else{
......
If statementAn If statement contains a Boolean expression and one or more statements.GrammarThe syntax for the IF statement is as follows:if (Boolean expression){If the Boolean expression is true, the statement executed}If the value of the Boolean
If statementAn If statement contains a Boolean expression and one or more statements.GrammarThe syntax for the IF statement is as follows:if (Boolean expression){If the Boolean expression is true, the statement executed}If the value of the Boolean
Recently the head is a little dizzy, in JavaScript write If-else If-else code, actually to else added conditions. The code is as follows:IE9 and Chrome under the execution of this script, found not to prompt the JS error, the program's execution
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