How to do exact division and remainder calculations in Go

How to perform accurate integer division and remainder calculations in Go language

When performing integer division and remainder calculations in Go language, we need to pay attention to the integer operations There is a loss of accuracy. To ensure accurate divisions and remainders, we can use some tricks and functions.

Integer division operations can be implemented by using the Floor function in the math package. This function can return the maximum integer value that is no greater than the given argument. Therefore, we can get the exact integer quotient by first dividing by the divisor and then rounding using the Floor function.

Remainder calculation can be achieved by first performing an integer division operation, then multiplying the resulting integer quotient by the divisor, and then subtracting the dividend. This ensures that the calculation of the remainder is accurate.

Let’s look at specific code examples:

package main

import (
    "fmt"
    "math"
)

func divideAndRemainder(dividend, divisor int) (quotient, remainder int) {
    quotient = int(math.Floor(float64(dividend) / float64(divisor))
    remainder = dividend - quotient*divisor
    return quotient, remainder
}

func main() {
    dividend := 13
    divisor := 5

    quotient, remainder := divideAndRemainder(dividend, divisor)

    fmt.Printf("%d 除以 %d 的整数商为 %d，余数为 %d
", dividend, divisor, quotient, remainder)
}

In the above code, we define a function divideAndRemainder to achieve accurate integer division and remainder calculations. In the main function, we test the calculation of the integer quotient and remainder of 13 divided by 5, and output the results.

Through the above code examples, we can implement accurate integer division and remainder calculations in the Go language, avoiding precision loss. I hope this article is helpful to you, thank you for reading!

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