Convert String to Float
To convert a String to a Float value in Go programming, use ParseFloat() function of strconv package.
In this tutorial, we will learn the syntax of ParseFloat() function, and how to use this function to parse or convert a string to float value.
Syntax
The syntax of ParseFloat() function is
ParseFloat(str string, bitSize int)
where str is string value, and bitSize the 32 or 64 which specifies the resulting size of float value in bits.
Return Value
The function returns (float, error).
Examples
Float Bit Size of 32
In the following program, we take a string str. We convert this string value to float value with bit size of 32.
example.go
package main
import (
"fmt"
"strconv"
)
func main() {
var str = "14.2356"
result, err := strconv.ParseFloat(str, 32)
if err == nil {
fmt.Println("The float value is :", result)
} else {
fmt.Println("There is an error converting string to float.")
}
} Output
The float value is : 14.235600471496582
Float Bit Size of 64
In the following program, we take a string str. We convert this string value to float value with bit size of 32.
example.go
package main
import (
"fmt"
"strconv"
)
func main() {
var str = "14.2356"
result, err := strconv.ParseFloat(str, 64)
if err == nil {
fmt.Println("The float value is :", result)
} else {
fmt.Println("There is an error converting string to float.")
}
} Output
The float value is : 14.2356
Negative Scenario
In the following program, we will take a string that has some non-numeric characters. We will try converting it to a float value. We should get an error.
example.go
package main
import (
"fmt"
"strconv"
)
func main() {
var str = "14.hello356"
result, err := strconv.ParseFloat(str, 64)
if err == nil {
fmt.Println("The float value is :", result)
} else {
fmt.Println("There is an error converting string to float.")
fmt.Println(err)
}
} Output
There is an error converting string to float. strconv.ParseFloat: parsing "14.hello356": invalid syntax
We received a “invalid syntax” error while trying to parse a string that contains characters not allowed in a float value.
Conclusion
In this Golang Tutorial, we learned how to convert a String to Float value in Go language, with example programs.