Golang how can i multiply an integer and float

Question

Golang how can i multiply an integer and float

I'm trying to resize an image, but when I compile, I get a constant of 0.8 truncated to an integer precision . This is my code

b := img.Bounds()

heightImg := b.Max.Y  // height of image in pixels
widthImg := b.Max.X   // width of image in pixels
const a = .80
height := int(heightImg * a) // reduce height by 20%
width := int(widthImg * a)  // reduce width by 20%

 // resize image below which take in type int, int in the 2nd & 3rd parameter
new_img := imaging.Resize(img,width,height, imaging.Lanczos)

I am new to golang but this code right here is giving me error

    height := int(heightImg * a) 
    width := int(widthImg * a)

any suggestions would be great

+4

go

Rome torres May 03 '17 at 19:24

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2 answers

var xx float64
xx = 0.29
fmt.Println(xx, xx * 100)

Result - 28.9999999999999996, conversion to integer - 28

var xx float32
xx = 0.29
fmt.Println(xx * 100)

Result 29, convert to int 29

0

chen youfu May 17 '19 at 3:11 am

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JimB · Accepted Answer · 2017-05-03T19:27:00+0000

If you want to multiply floats, you need to convert the number to float:

height := int(float64(heightImg) * a) 
width := int(float64(widthImg) * a)

Golang how can i multiply an integer and float

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