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Go Recipes.pdf (6.25 MB)

2016-12-22 09:24:44 上传

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关键词：Recipes Recipe CIP IPE

1. Listing 1-1. Declare Variables Using the var Keyword
   
2. package main
   
3. import "fmt"
   
4. func main() {
   
5. var fname string
   
6. var lname string
   
7. var age int
   
8. fmt.Println("First Name:", fname)
   
9. fmt.Println("Last Name:", lname)
   
10. fmt.Println("Age:", age)
    
11. }

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1. Listing 1-2. Short Variable Declarations and Declaration of Package Variables
   
2. package main
   
3. import "fmt"
   
4. // Declare constant
   
5. const Title = "Person Details"
   
6. // Declare package variable
   
7. var Country = "USA"
   
8. func main() {
   
9. fname, lname := "Shiju", "Varghese"
   
10. age := 35
    
11. // Print constant variable
    
12. fmt.Println(Title)
    
13. // Print local variables
    
14. fmt.Println("First Name:", fname)
    
15. fmt.Println("Last Name:", lname)
    
16. fmt.Println("Age:", age)
    
17. // Print package variable
    
18. fmt.Println("Country:", Country)
    
19. }

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1. Listing 1-3. An Executable Program in main.go Under $GOPATH/src/hello
   
2. package main
   
3. import "fmt"
   
4. func main() {
   
5. fmt.Println("Hello, World")
   
6. }

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1. Listing 1-5. Package main That Reuses the strutils Package
   
2. package main
   
3. import (
   
4. "fmt"
   
5. "github.com/shijuvar/go-recipes/ch01/strutils"
   
6. )
   
7. func main() {
   
8. str1, str2 := "Golang", "gopher"
   
9. // Convert to uppercase
   
10. fmt.Println("To Upper Case:", strutils.ToUpperCase(str1))
    
11. // Convert to lowercase
    
12. fmt.Println("To Lower Case:", strutils.ToUpperCase(str1))
    
13. // Convert first letter to uppercase
    
14. fmt.Println("To First Upper:", strutils.ToFirstUpper(str2))
    
15. }

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1. Listing 1-8. Program That Uses the Wrong Format Specifier for Printing a Floating-Point Number
   
2. package main
   
3. import "fmt"
   
4. func main() {
   
5. floatValue:=4.99
   
6. fmt.Printf("The value is: %d",floatValue)
   
7. }

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