What is the type of return value of golang function?

Go functions can return values ​​of one or more types, which need to be explicitly specified in the signature. A single-return value function returns a single value of a specific type, while a multiple-return value function returns multiple values ​​of a specified type in sequence. In practical applications, such as a function that calculates the greatest common divisor (GCD) of two numbers, it can return a specific type of GCD value on demand.

The type of return value of Go language function

In Go language, a function can return one or more values, and these The type of the value must be explicitly specified in the function signature. The type of values ​​returned by a function determines how those values ​​can be used outside the function.

Single return value functions

Single return value functions return a value of a specific type, which is specified in the function signature. For example:

func square(x int) int {
    return x * x
}

In this function, square returns a value of type int because it receives an int parameter and returns a int value.

Multiple-return-value functions

Multiple-return-value functions return values ​​of two or more types, specified sequentially in the function signature. For example:

func divmod(x, y int) (quotient, remainder int) {
    quotient = x / y
    remainder = x % y
    return
}

In this function, divmod returns two values: a quotient of type int and a remainder of type int. Note that the type of the return value is specified sequentially in the function signature: quotient is of type int, and remainder is also of type int.

Practical Case

Consider a function that calculates the greatest common divisor (GCD) of two numbers:

import "math/big"

func gcd(a, b *big.Int) *big.Int {
    if b == 0 {
        return a
    }
    return gcd(b, a.Mod(a, b))
}

func main() {
    // 计算 100 和 55 的 GCD
    result := gcd(big.NewInt(100), big.NewInt(55))
    fmt.Println(result) // 输出：5
}

In this case, The gcd function returns a GCD value of type *big.Int. Since GCD may be a large integer, the big package is used to handle large integers.

Conclusion

The types of values ​​returned by Go language functions are explicitly specified in the function signature and determine how those values ​​can be used outside the function. You can return one or more values ​​through a single-return value function or a multiple-return value function.

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