7x31/the-way-to-go_ZH_CN
1
0
Fork 0
mirror of https://github.com/unknwon/the-way-to-go_ZH_CN.git synced 2025-08-12 03:55:28 +08:00
Code Issues Packages Projects Releases Wiki Activity

fix: coding style and file format for chapter 6.

Browse Source
This commit is contained in:
Bo-Yi Wu
2017-02-11 12:24:19 +08:00
parent 0dee646030
commit 72c3839734
11 changed files with 290 additions and 279 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
eBook/exercises/chapter_6/10to1_recursive.go
View File

@@ -7,7 +7,9 @@ func main() {
} }
func printrec(i int) { func printrec(i int) {
if i>10 { return } if i > 10 {
printrec(i+1) return
}
printrec(i + 1)
fmt.Printf("%d ", i) fmt.Printf("%d ", i)
} }

5
eBook/exercises/chapter_6/error_returnval.go
View File

@@ -29,7 +29,7 @@ func main() {
func MySqrt(f float64) (float64, error) { func MySqrt(f float64) (float64, error) {
//return an error as second parameter if invalid input //return an error as second parameter if invalid input
if (f < 0) { if f < 0 {
return float64(math.NaN()), errors.New("I won't be able to do a sqrt of negative number!") return float64(math.NaN()), errors.New("I won't be able to do a sqrt of negative number!")
} }
//otherwise use default square root function //otherwise use default square root function
@@ -38,7 +38,7 @@ func MySqrt(f float64) (float64, error) {
//name the return variables - by default it will have 'zero-ed' values i.e. numbers are 0, string is empty, etc. //name the return variables - by default it will have 'zero-ed' values i.e. numbers are 0, string is empty, etc.
func MySqrt2(f float64) (ret float64, err error) { func MySqrt2(f float64) (ret float64, err error) {
if (f < 0) { if f < 0 {
//then you can use those variables in code //then you can use those variables in code
ret = float64(math.NaN()) ret = float64(math.NaN())
err = errors.New("I won't be able to do a sqrt of negative number!") err = errors.New("I won't be able to do a sqrt of negative number!")
@@ -49,6 +49,7 @@ func MySqrt2(f float64) (ret float64, err error) {
//automatically return the named return variables ret and err //automatically return the named return variables ret and err
return return
} }
/* Output: /* Output:
First example with -1: Error! Return values are: NaN I won't be able to do a sqrt of negative number! First example with -1: Error! Return values are: NaN I won't be able to do a sqrt of negative number!
Second example with 5: It's ok! Return values are: 2.23606797749979 <nil> Second example with 5: It's ok! Return values are: 2.23606797749979 <nil>

4
eBook/exercises/chapter_6/fibonacci2.go
View File

@@ -15,8 +15,8 @@ func fibonacci(n int) (val, pos int) {
if n <= 1 { if n <= 1 {
val = 1 val = 1
} else { } else {
v1, _ := fibonacci(n-1) v1, _ := fibonacci(n - 1)
v2, _ := fibonacci(n-2) v2, _ := fibonacci(n - 2)
val = v1 + v2 val = v1 + v2
} }
pos = n pos = n

4
eBook/exercises/chapter_6/fibonacci_closure.go
View File

@@ -14,7 +14,7 @@ func main() {
f := fib() f := fib()
// Function calls are evaluated left-to-right. // Function calls are evaluated left-to-right.
// println(f(), f(), f(), f(), f()) // println(f(), f(), f(), f(), f())
for i:=0; i<=9; i++ { for i := 0; i <= 9; i++ {
println(i+2, f() ) println(i+2, f())
} }
} }

2
eBook/exercises/chapter_6/function_filter2.go
View File

@@ -34,4 +34,4 @@ func main() {
/* /*
*/ */

1
eBook/exercises/chapter_6/lambda_value.go
View File

@@ -12,6 +12,7 @@ func main() {
fv() fv()
fmt.Printf("The type of fv is %T", fv) fmt.Printf("The type of fv is %T", fv)
} }
/* Output: /* Output:
Hello World! Hello World!
The type of fv is func() The type of fv is func()

11
eBook/exercises/chapter_6/mult_returnval.go
View File

@@ -6,7 +6,7 @@ import (
) )
func SumProductDiff(i, j int) (int, int, int) { func SumProductDiff(i, j int) (int, int, int) {
return i+j, i*j, i-j return i + j, i * j, i - j
} }
func SumProductDiffN(i, j int) (s int, p int, d int) { func SumProductDiffN(i, j int) (s int, p int, d int) {
@@ -15,10 +15,11 @@ func SumProductDiffN(i, j int) (s int, p int, d int) {
} }
func main() { func main() {
sum, prod, diff := SumProductDiff(3,4) sum, prod, diff := SumProductDiff(3, 4)
fmt.Println("Sum:", sum, "| Product:",prod, "| Diff:", diff) fmt.Println("Sum:", sum, "| Product:", prod, "| Diff:", diff)
sum, prod, diff = SumProductDiffN(3,4) sum, prod, diff = SumProductDiffN(3, 4)
fmt.Println("Sum:", sum, "| Product:",prod, "| Diff:", diff) fmt.Println("Sum:", sum, "| Product:", prod, "| Diff:", diff)
} }
// Sum: 7 | Product: 12 | Diff: -1 // Sum: 7 | Product: 12 | Diff: -1
// Sum: 7 | Product: 12 | Diff: -1 // Sum: 7 | Product: 12 | Diff: -1

8
eBook/exercises/chapter_6/strings_map.go
View File

@@ -7,7 +7,13 @@ import (
) )
func main() { func main() {
asciiOnly := func(c rune) rune { if c > 127 { return ' ' }; return c } asciiOnly := func(c rune) rune {
if c > 127 {
return ' '
}
return c
}
fmt.Println(strings.Map(asciiOnly, "Jérôme Österreich")) fmt.Println(strings.Map(asciiOnly, "Jérôme Österreich"))
} }
// J r me sterreich // J r me sterreich

6
eBook/exercises/chapter_6/varargs.go
View File

@@ -14,9 +14,9 @@ func main() {
} }
func printInts(list ...int) { func printInts(list ...int) {
// for i:=0; i<len(list); i++ { // for i:=0; i<len(list); i++ {
// fmt.Printf("%d\n", list[i]) // fmt.Printf("%d\n", list[i])
// } // }
for _, v := range list { for _, v := range list {
fmt.Printf("%d\n", v) fmt.Printf("%d\n", v)
} }