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