70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
/////////////////////////////////
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// Converting Types
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// Go Playground: https://play.golang.org/p/7ZrTlWsLpjt
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/////////////////////////////////
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package main
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import (
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"fmt"
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"strconv"
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)
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func main() {
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var x = 3 //int type
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var y = 3.2 //float type
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// x = x * y //compile error -> mismatched types
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x = x * int(y) // converting float64 to int
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fmt.Println(x) // => 9
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y = float64(x) * y //converting int to float64
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fmt.Println(y) // => 28.8
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x = int(float64(x) * y)
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fmt.Println(x) // => 259
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//In Go types with different names are different types.
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var a int = 5 // same size as int64 or int32 (platform specific)
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var b int64 = 2 // int and int64 are not the same type
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// a = b // error: cannot use b (type int64) as type int in assignment
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a = int(b) // converting int64 to int (explicit conversion required)
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// preventing unused variable error
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_ = a
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//** CONVERTING NUMBERS TO STRINGS AND STRINGS TO NUMBERS **//
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s := string(99) // int to rune (Unicode code point)
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fmt.Println(s) // => 99, the ascii code for symbol c
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fmt.Println(string(34234)) // => 34234 is the unicode code point for 薺
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// we cannot convert a float to a string similar to an int to a string
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// s1 := string(65.1) // error
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// converting float to string
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var myStr = fmt.Sprintf("%f", 5.12)
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fmt.Println(myStr) // => 5.120000
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// converting int to string
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var myStr1 = fmt.Sprintf("%d", 34234)
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fmt.Println(myStr1) // => 34234
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// converting string to float
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var result, err = strconv.ParseFloat("3.142", 64)
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if err == nil {
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fmt.Printf("Type: %T, Value: %v\n", result, result) // => Type: float64, Value: 3.142
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} else {
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fmt.Println("Cannot convert to float64!")
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}
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// Atoi(string to int) and Itoa(int to string).
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i, err := strconv.Atoi("-50")
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s = strconv.Itoa(20)
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fmt.Printf("i Type is %T, i value is %v\n", i, i) // => i Type is int, i value is -50
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fmt.Printf("s Type is %T, s value is %q\n", s, s) // => s Type is string, s value is "20"
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}
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