Converting a string variable into Boolean, Integer or Float type in Golang

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:

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// 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")
  
}

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Output:

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:

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// 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")
  
}

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Output:

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:

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// 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")
  
}

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Output:

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 



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