在帖子中调用函数的无限循环

Question

Cycle loops, when I increment i by the function, but no via i++.

package main

import "fmt"

func increment(i int) (int) {
    i++
    return i
}

func condition_true(i int) (bool) {
    if i < 10 {
        return true
    } else {
        return false
    }
}

func main() {
    for i := 1; condition_true(i); increment(i) {
        fmt.Println(i)
    }
}

compiler to play around

Answer 1

You should do i = increment(i).

Otherwise, the i used in the loop is not modified.

for i := 1; condition_true(i); i = increment(i) {
    fmt.Println(i)
}

That one works as you'd expect.

https://play.golang.org/p/dwHbV1iY0_

Alternatively, allow increment to modify i by receiving a pointer to it:

func increment(i *int) {
   *i++
}

And then use it like this in the loop:

for i := 1; condition_true(i); increment(&i) {
    fmt.Println(i)
}