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fix: coding style and file format for chapter 6.

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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
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4
eBook/exercises/chapter_6/10to1_recursive.go
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@@ -7,7 +7,9 @@ func main() {
} }
func printrec(i int) { func printrec(i int) {
if i>10 { return } if i > 10 {
return
}
printrec(i + 1) printrec(i + 1)
fmt.Printf("%d ", i) fmt.Printf("%d ", i)
} }

5
eBook/exercises/chapter_6/error_returnval.go
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@@ -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>

1
eBook/exercises/chapter_6/lambda_value.go
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@@ -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()

1
eBook/exercises/chapter_6/mult_returnval.go
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@@ -20,5 +20,6 @@ func main() {
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
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@@ -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