io - Go channels and I/O -

first function

readf2c

takes filename , channel, reads file , inputs in channel. second function

writec2f

takes 2 channels , filename, takes value of each channel , saves lower value in output file. i'm sure there few syntax errors i'm new go

package main  import (     "fmt"     "bufio"     "os"     "strconv" )  func main() {     fmt.println("hello world!\n\n")     cs1 := make (chan int)     var nameinput string = "input.txt"     readf2c(nameinput,cs1)     cs2 := make (chan int)     cs3 := make (chan int)     cs2 <- 10     cs2 <- 16     cs2 <- 7     cs2 <- 2     cs2 <- 5     cs3 <- 8     cs3 <- 15     cs3 <- 14     cs3 <- 1     cs3 <- 6     var nameoutput string = "output.txt"     writec2f (nameoutput,cs2,cs3) }  func readf2c (fn string, ch chan int){     f,err := os.open(fn)     r := bufio.newreader(f)     err != nil { // not end of file       fmt.println(r.readstring('\n'))     ch <- r.readstring('\n')     }      if err != nil {         fmt.println(r.readstring('\n'))             ch <- -1     }  } func writec2f(fn string, // output text file ch1 chan int, // first input channel ch2 chan int){     var j int = 0     var channel1temp int     var channel2temp int         f,_ := os.create(fn)         w := bufio.newwriter(f)     channel1temp = <-ch1     channel2temp = <-ch2     j := 1; j <= 5; j++ {      if (channel2temp < channel1temp){          n4, err := w.writestring(strconv.itoa(channel1temp))         } else{          n4, err := w.writestring(strconv.itoa(channel2temp))         }     w.flush()     } } 

this error messages get:

prog.go:38: multiple-value r.readstring() in single-value context prog.go:65: w.flush undefined (cannot refer unexported field or method bufio.(*writer)."".flush) 

there multiple errors:

1)

unlike c, go enforces have curly braces directly after statements. if case (and same func), instead of doing this:

if (channel2temp < channel1temp) { 

use this

if channel2temp < channel1temp { 

2)

there no while in go. use for

for { ... } 

or

for channel1temp != null || channel2temp != null { ... } 

3)

usage of non-declared variables. easy fix making short variable declaration first time initialize variable. instead of:

r = bufio.newreader(file) 

use

r := bufio.newreader(file) 

4)

trying assign multi-value return single variable. if function returns 2 values , need one, variable don't want can discarded assigning _. instead of:

file := os.open(fn) 

use

file, _ := os.open(fn) 

but best practice catch error:

file, err := os.open(fn) if err != nil {     panic(err) } 

there more errors on top of this, maybe started. suggest reading effective go since explain many of things i've mentioned.

edit:

and there online sure. might new language, online material useful. below few used when learning go:

• effective go: document on how write idiomatic go code
• the go programming language tour: online tour of go interactive examples.
• go example: interactive examples of go programs, starting hello world.
• go specification: surprisingly readable being specification. maybe not start point, useful.