package main
import (
"fmt"
"math"
)
//
// -----------------------------------------------------------------------------
// Determines whether a float64 contains an integer (no fractional part).
// Uses a small tolerance to safely handle floating‑point precision issues.
// -----------------------------------------------------------------------------
func isInteger(value float64) bool {
const epsilon float64 = 1e-12
// math.Floor returns the largest integer <= value
floored := math.Floor(value)
// If the difference is extremely small, treat the number as an integer
return math.Abs(value-floored) < epsilon
}
//
// -----------------------------------------------------------------------------
// Prints a descriptive message for the given float64.
// -----------------------------------------------------------------------------
func printCheck(value float64) {
fmt.Printf("Checking value: %.15f\n", value)
if isInteger(value) {
fmt.Println("Result: The value contains an integer.\n")
} else {
fmt.Println("Result: The value contains a floating‑point number.\n")
}
}
//
// -----------------------------------------------------------------------------
// Entry point demonstrating several example values.
// -----------------------------------------------------------------------------
func main() {
// Example input values
var a float64 = 42.0 // integer-like
var b float64 = 42.00000000001 // floating-point due to tiny fraction
var c float64 = 89.0000000000001 // integer-like
var d float64 = -7.0 // negative integer-like
var e float64 = 3.14 // floating-point
// Run checks
printCheck(a)
printCheck(b)
printCheck(c)
printCheck(d)
printCheck(e)
}
/*
run:
Checking value: 42.000000000000000
Result: The value contains an integer.
Checking value: 42.000000000009997
Result: The value contains a floating‑point number.
Checking value: 89.000000000000099
Result: The value contains an integer.
Checking value: -7.000000000000000
Result: The value contains an integer.
Checking value: 3.140000000000000
Result: The value contains a floating‑point number.
*/
