Go convert float to a string | Code Ease (2024)

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Answered on: Sunday 12 May, 2024 / Duration: 21 min read

Programming Language: Go , Popularity :3/10

Solution 1:

In Go, you can convert a float to a string using the strconv package. Here is an example code snippet demonstrating this:

go
package main
import (
 "fmt"
 "strconv"
)
func main() {
 // Float value to convert to string
 floatNum := 3.14159
 // Convert float to string
 strNum := strconv.FormatFloat(floatNum, 'f', -1, 64)
 // Print the converted string
 fmt.Println("Float converted to string:", strNum)
}

Output:


Float converted to string: 3.14159

In this example, the FormatFloat function from the strconv package is used to convert the float value 3.14159 to a string. The second argument 'f' specifies the format of the float (in this case, decimal notation), the third argument -1 tells the function to use the smallest number of digits necessary, and the fourth argument 64 specifies that the float is a float64 type.

Solution 2:

Converting Float to String in Go

Converting a floating-point number (float32 or float64) to a string in Go is straightforward using the strconv.FormatFloat function.

Syntax:

go
func FormatFloat(f float64, fmt byte, prec, bitSize int) string

Parameters:

* f: The floating-point number to convert.
* fmt: The format of the resulting string.
* prec: The precision of the resulting string.
* bitSize: The bit size of the floating-point number (32 or 64).

Formats:

The fmt parameter can take the following values:

* 'b': Binary notation
* 'e': Scientific notation (e.g., 1.23e+10)
* 'f': Fixed-point notation (e.g., 123.45)
* 'g': Automatic selection between scientific and fixed-point notation based on the magnitude of the number
* 'p': Binary exponent notation (e.g., 0x1.2p+10)

Precision and Bit Size:

* prec specifies the number of digits after the decimal point in the resulting string.
* bitSize specifies the bit size of the floating-point number being converted (32 or 64).

Code Examples:

Example 1: Convert float32 to string in fixed-point notation with 2 decimal places:

go
import "strconv"
func main() {
 f := float32(123.456)
 s := strconv.FormatFloat(float64(f), 'f', 2, 32)
 fmt.Println(s) // Output: 123.46
}

Example 2: Convert float64 to string in scientific notation with 4 decimal places:

go
import "strconv"
func main() {
 f := 1.23456789e10
 s := strconv.FormatFloat(f, 'e', 4, 64)
 fmt.Println(s) // Output: 1.2346e+10
}

Output:


123.46
1.2346e+10

Solution 3:

In Go, you can convert a float to a string using the strconv.FormatFloat function from the strconv package. This function takes two arguments: the float value and the precision (the number of digits after the decimal point). Here's an example:

go
package main
import (
"fmt"
"strconv"
)
func main() {
var f float64 = 123.456789
fmt.Println("Float value:", f)
// Convert float to string with 2 digits after the decimal point
str := strconv.FormatFloat(f, 'f', 2, 64)
fmt.Println("String value:", str)
// Convert string back to float
f2, err := strconv.ParseFloat(str, 64)
if err == nil {
fmt.Println("Float value from string:", f2)
}
}

Output:


Float value: 123.456789
String value: 123.46
Float value from string: 123.46

In this example, the strconv.FormatFloat function converts the float value 123.456789 to a string with 2 digits after the decimal point, resulting in "123.46". Then, the strconv.ParseFloat function converts the string back to a float.

Note that the second argument of strconv.FormatFloat is a rune that specifies the format of the output string. You can use 'f' for fixed-point notation, 'e' for exponential notation, or 'g' for either fixed-point or exponential notation, depending on the precision. The third argument is the precision (number of digits after the decimal point), and the fourth argument is the bit size of the float (32 or 64).