tasks a-s

Task/Non-decimal-radices-Input/Go/non-decimal-radices-input.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+    "bytes"
+    "fmt"
+    "math/big"
+    "strconv"
+)
+
+func main() {
+    // package strconv:  the most common string to int conversion,
+    // base 10 only.
+    x, _ := strconv.Atoi("13")
+    fmt.Println(x)
+
+    // ParseInt handles arbitrary bases from 2 to 36, and returns
+    // a result of the requested size (64 bits shown here.)
+    x64, _ := strconv.ParseInt("3c2", 19, 64)
+    fmt.Println(x64)
+
+    // package bytes+fmt:  allows direct conversion from strings
+    // to integer types for bases 2, 8, 10, and 16.
+    // (Fscanf and scanf are more common for reading from
+    // files or stdin than for reading from strings.)
+    fmt.Fscanf(bytes.NewBufferString("1101"), "%b", &x)
+    fmt.Println(x)
+
+    fmt.Fscanf(bytes.NewBufferString("15"), "%o", &x)
+    fmt.Println(x)
+
+    fmt.Fscanf(bytes.NewBufferString("13"), "%d", &x)
+    fmt.Println(x)
+
+    fmt.Fscanf(bytes.NewBufferString("d"), "%x", &x)
+    fmt.Println(x)
+
+    // package big:  allows conversion from string to big integer.
+    // any base from 2 to 16 can be specified as second parameter.
+    var z big.Int
+    z.SetString("111", 3)
+    fmt.Println(&z)
+
+    // if second parameter is 0, base is determined by prefix, if any
+    z.SetString("0b1101", 0) // 0b -> base 2
+    fmt.Println(&z)
+
+    z.SetString("015", 0) // 0 -> base 8
+    fmt.Println(&z)
+
+    z.SetString("13", 0) // no prefix -> base 10
+    fmt.Println(&z)
+
+    z.SetString("0xd", 0) // 0x -> base 16
+    fmt.Println(&z)
+}