http://golang.org/pkg/fmt/#Scanf

All the included libraries in Go are well documented.

That being said, I believe

func main() {
var i int
_, err := fmt.Scanf("%d", &i)
}

does the trick

An alternative that can be a bit more concise is to just use fmt.Scan:

package main


import "fmt"


func main() {
var i int
fmt.Scan(&i)
fmt.Println("read number", i, "from stdin")
}

This uses reflection on the type of the argument to discover how the input should be parsed.

http://golang.org/pkg/fmt/#Scan

Here is my "Fast IO" method for reading positive integers. It could be improved with bitshifts and laying out memory in advance.

package main


import (
"io/ioutil"
"bufio"
"os"
"strconv"
)




func main() {
out := bufio.NewWriter(os.Stdout)
ints := getInts()
var T int64
T, ints = ints[0], ints[1:]
..
out.WriteString(strconv.Itoa(my_num) + "\n")
out.Flush()
}
}


func getInts() []int64 {
//assumes POSITIVE INTEGERS. Check v for '-' if you have negative.
var buf []byte
buf, _ = ioutil.ReadAll(os.Stdin)
var ints []int64
num := int64(0)
found := false
for _, v := range buf {
if '0' <= v && v <= '9' {
num = 10*num + int64(v - '0') //could use bitshifting here.
found = true
} else if found {
ints = append(ints, num)
found = false
num = 0
}
}
if found {
ints = append(ints, num)
found = false
num = 0
}
return ints
}

Golang fmt.Scan is simpler than Golang fmt.Scanf (which is simpler than Clang scanf)

If fmt.Scan errors i.e. if not nil, log & return

1 Read single variable:

import (
"fmt"
"log"
)


var i int
if    _, err := fmt.Scan(&i);    err != nil {
log.Print("  Scan for i failed, due to ", err)
return
}


fmt.Println(i)

2 Read multiple variables:

import (
"fmt"
"log"
)


var i, j, k int
if    _, err := fmt.Scan(&i, &j, &k);    err != nil {
log.Print("  Scan for i, j & k failed, due to ", err)
return
}


fmt.Println(i, j, k)

Best of luck

Example from: http://www.sortedinf.com/?q=golang-in-1-hour

You can use fmt.Scanf with a format specifier. The format specifier for the integer is %d. So you can use standard input like below.

func main() {
var someVar int
fmt.Scanf("%d", &someVar)
}

or else you can use fmt.Scan or fmt.Scanln as below.

func main() {
var someVar int
fmt.Scanln(&someVar)
}

You could also use bufio.NewReader to read an integer from the standard input.

The below program:

• Prompts for an integer input

• Creates a bufio.Reader to read from standard input

• Reads input till it encounters a newline character '\n' (Note that this will only read a single integer. Space separated values will not work)

• Removes the newline character

• Converts string to int

package main


import (
"fmt"
"bufio"
"os"
"strconv"
"strings"
)


func getInt() error {
fmt.Println("Enter an integer")
userInput  := bufio.NewReader(os.Stdin)
userVal, err := userInput.ReadString('\n')
if err != nil {
return err
}


input := strings.TrimSpace(userVal)
intVal, err := strconv.Atoi(input)
if err != nil {
return err
}


fmt.Printf("You entered: %d\n", intVal)
return nil
}


func main() {
getInt()
}

Why can't we just use a scanf? just like we use in C? it's working though.

package main
import "fmt"
func main() {
var i int
fmt.Scanf("%d", &i)
fmt.Println(i)
}