JuniorTheoryCommon

What does the program print?

package main

import (
    "fmt"
    "strconv"
)

func main() {
    n, err := strconv.Atoi("12a")
    fmt.Println(n, err != nil)
}

0 true

Expecting 12: strconv.Atoi does not stop at the first non-digit; it rejects the whole string and returns 0 with a non-nil error.
Expecting false, as with C's atoi: Go reports a bad number through the second result, so err is not nil and err != nil prints true.

JuniorTheoryCommon

package main

import (
    "fmt"
    "strconv"
)

func main() {
    n, err := strconv.Atoi("12a")
    fmt.Println(n, err != nil)
}

0 true

Expecting 12: strconv.Atoi does not stop at the first non-digit; it rejects the whole string and returns 0 with a non-nil error.
Expecting false, as with C's atoi: Go reports a bad number through the second result, so err is not nil and err != nil prints true.