Converting a string variable into Boolean, Integer or Float type in Golang
Last Updated :
10 May, 2020
Various types of string conversions are needed while performing tasks in Golang. Package
strconv is imported to perform conversions to and from string.
String to Boolean Conversion
ParseBool is used to convert string to boolean value. It accepts 1, t, T, TRUE, true, True as
true and 0, f, F, FALSE, false, False as
false. Any other value returns an error and will display the value as false.
Example:
C
// Golang program to convert a string
// into Boolean data type
package main
import (
"fmt"
"reflect"
"strconv"
)
func main() {
str := "GeeksforGeeks"
fmt.Println("Before :", reflect.TypeOf(str))
fmt.Println("String value is: ", str)
b, _ := strconv.ParseBool(str)
fmt.Println("After :", reflect.TypeOf(b))
fmt.Println("Boolean value is: ", b, "\n")
str1 := "t"
fmt.Println("Before :", reflect.TypeOf(str1))
fmt.Println("String value is: ", str1)
b1, _ := strconv.ParseBool(str1)
fmt.Println("After :", reflect.TypeOf(b1))
fmt.Println("Boolean value is: ", b1, "\n")
str2 := "0"
fmt.Println("Before :", reflect.TypeOf(str2))
fmt.Println("String value is: ", str2)
b2, _ := strconv.ParseBool(str2)
fmt.Println("After :", reflect.TypeOf(b2))
fmt.Println("Boolean value is: ", b2, "\n")
}
Before : string
String value is: GeeksforGeeks
After : bool
Boolean value is: false
Before : string
String value is: t
After : bool
Boolean value is: true
Before : string
String value is: 0
After : bool
Boolean value is: false
String to Integer Conversion
ParseInt function is used to convert string to an integer value. It interprets a string in the given base (0, 2 to 36) and bit size (0 to 64) and returns the corresponding value.
Example:
C
// Golang program to convert String
// into Integer Data type
package main
import (
"fmt"
"reflect"
"strconv"
)
func main() {
str := "GeeksforGeeks"
fmt.Println("Before :", reflect.TypeOf(str))
fmt.Println("String value is: ", str)
i, _ := strconv.ParseInt(str, 10, 64)
fmt.Println("After :", reflect.TypeOf(i))
fmt.Println("Integer value is: ", i, "\n")
str1 := "100"
fmt.Println("Before :", reflect.TypeOf(str1))
fmt.Println("String value is: ", str1)
i1, _ := strconv.ParseInt(str1, 10, 64)
fmt.Println("After :", reflect.TypeOf(i1))
fmt.Println("Integer value is: ", i1, "\n")
}
Before : string
String value is: GeeksforGeeks
After : int64
Integer value is: 0
Before : string
String value is: 100
After : int64
Integer value is: 100
String to Float Conversion
ParseFloat is used to convert the string to float type with the precision specified by bitSize: 32 for float32, or 64 for float64. When bitSize=32, the result still has type float64, but it will be convertible to float32 without changing its value.
Example:
C
// Golang program to convert
// String into Float Data type
package main
import (
"fmt"
"reflect"
"strconv"
)
func main() {
str := "3.1415926535"
fmt.Println("Before :", reflect.TypeOf(str))
fmt.Println("String value is: ", str)
f, _ := strconv.ParseFloat(str, 64)
fmt.Println("After :", reflect.TypeOf(f))
fmt.Println("Float value is: ", f, "\n")
str1 := "3.1415926535"
fmt.Println("Before :", reflect.TypeOf(str1))
fmt.Println("String value is: ", str1)
f1, _ := strconv.ParseFloat(str1, 32)
fmt.Println("After :", reflect.TypeOf(f1))
fmt.Println("Float value is: ", f1, "\n")
}
Before : string
String value is: 3.1415926535
After : float64
Float value is: 3.1415926535
Before : string
String value is: 3.1415926535
After : float64
Float value is: 3.1415927410125732