2.19. Go language if…else statement

if statement, you can use the optional else statement, else expression in the statement is the Boolean expression false when it is executed.

2.19.1. Grammar #

In programming Go language the syntax of the if...else statement is as follows:

If Boolean expression { /* Execute when Boolean expression is true */ } else { /* Execute when Boolean expression is false */ } 

When If is in a Boolean expression of true , the block of statements immediately following the execution of the false then execute `` else``sentence block.

The flow chart is as follows:

2.19.2. Example #

Use if else to judge the size of a number:

Example #

package main import "fmt" func main() { /* Definition of Local Variables */ var a int = 100; /* Judging Boolean Expressions */ if a < 20 { /* If the condition is true, execute the following statement */ fmt.Printf("A less than 20\\n" ); } else { /* If the condition is false, execute the following statement */ fmt.Printf("A not less than 20\\n" ); } fmt.Printf("The value of a is: %d\\n", a); } 

The result of the above code execution is:

A not less than 20 The value of a is: 100 