github.com/rsc/tmp@v0.0.0-20240517235954-6deaab19748b/bootstrap/internal/gc/big/example_test.go (about)

     1  // Do not edit. Bootstrap copy of /Users/rsc/g/go/src/cmd/internal/gc/big/example_test.go
     2  
     3  // Copyright 2012 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package big_test
     8  
     9  import (
    10  	"fmt"
    11  	"log"
    12  	"math/big"
    13  )
    14  
    15  func ExampleRat_SetString() {
    16  	r := new(big.Rat)
    17  	r.SetString("355/113")
    18  	fmt.Println(r.FloatString(3))
    19  	// Output: 3.142
    20  }
    21  
    22  func ExampleInt_SetString() {
    23  	i := new(big.Int)
    24  	i.SetString("644", 8) // octal
    25  	fmt.Println(i)
    26  	// Output: 420
    27  }
    28  
    29  func ExampleRat_Scan() {
    30  	// The Scan function is rarely used directly;
    31  	// the fmt package recognizes it as an implementation of fmt.Scanner.
    32  	r := new(big.Rat)
    33  	_, err := fmt.Sscan("1.5000", r)
    34  	if err != nil {
    35  		log.Println("error scanning value:", err)
    36  	} else {
    37  		fmt.Println(r)
    38  	}
    39  	// Output: 3/2
    40  }
    41  
    42  func ExampleInt_Scan() {
    43  	// The Scan function is rarely used directly;
    44  	// the fmt package recognizes it as an implementation of fmt.Scanner.
    45  	i := new(big.Int)
    46  	_, err := fmt.Sscan("18446744073709551617", i)
    47  	if err != nil {
    48  		log.Println("error scanning value:", err)
    49  	} else {
    50  		fmt.Println(i)
    51  	}
    52  	// Output: 18446744073709551617
    53  }