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6 years ago
## atoi
6 years ago
### Instructions
- Write a function that simulates the behaviour of the `Atoi` function in Go. `Atoi` transforms a number represented as a `string` in a number represented as an `int`.
- `Atoi` returns `0` if the `string` is not considered as a valid number. For this exercise **non-valid `string` chains will be tested**. Some will contain non-digits characters.
3 years ago
- For this exercise the handling of the signs `+` or `-` **does have** to be taken into account.
- This function will **only** have to return the `int`. For this exercise the `error` result of `Atoi` is not required.
### Expected function
```go
func Atoi(s string) int {
}
```
6 years ago
### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
"piscine"
)
func main() {
fmt.Println(piscine.Atoi("12345"))
fmt.Println(piscine.Atoi("0000000012345"))
fmt.Println(piscine.Atoi("012 345"))
fmt.Println(piscine.Atoi("Hello World!"))
fmt.Println(piscine.Atoi("+1234"))
fmt.Println(piscine.Atoi("-1234"))
fmt.Println(piscine.Atoi("++1234"))
fmt.Println(piscine.Atoi("--1234"))
}
```
And its output :
```console
$ go run .
12345
12345
0
0
1234
-1234
0
0
$
```
### Notions
- [strconv/Atoi](https://golang.org/pkg/strconv/#Atoi)