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How to Convert string to float type in Golang?
  • Last Updated : 19 May, 2020

ParseFloat function is an in-build function in the strconv library which converts the string type into a floating-point number with the precision specified by bit size.

Example: In this example the same string -2.514 is being converted into float data type and then their sum is being printed. Once it is converted to 8 bit-size and other times it is 32 bit-size. Both yield different results because ParseFloat accepts decimal and hexadecimal floating-point number syntax. If a1 or a2 is well-formed and near a valid floating-point number, ParseFloat returns the nearest floating-point number rounded using IEEE754 unbiased rounding which is parsing a hexadecimal floating-point value only rounds when there are more bits in the hexadecimal representation than will fit in the mantissa.




// Golang program to Convert
// string to float type
package main
  
import (
    "fmt"
    "strconv"
)
  
func main() {
  
    // defining a string a1
    a1 := "-2.514"
  
    // converting the string a1 
    // into float and storing it
    // in b1 using ParseFloat
    b1, _ := strconv.ParseFloat(a1, 8)
  
    // printing the float b1
    fmt.Println(b1)
  
    a2 := "-2.514"
    b2, _ := strconv.ParseFloat(a2, 32)
    fmt.Println(b2)
  
    fmt.Println(b1 + b2)
}

Output:

-2.514
-2.5139999389648438
-5.027999938964843
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