Why am I getting the 'more than one character in rune literal' error when checking for odd or even numbers in Go?

More Than One Character in Rune Literal in Go

Question:

A new programmer is encountering an error while trying to determine if a number is odd or even. They receive the error, "more than one character in rune literal." Can you explain the root cause of this issue?

Answer:

In Go, single quotes are used for rune literals, which represent single Unicode characters. In the code provided, the programmer is using single quotes for the format specifier in the fmt.Printf function, which should instead be enclosed in double quotes. Here is the corrected code:

package main

import "fmt"

func main() {
    var a int
    fmt.Printf("Enter the number: ")
    fmt.Scanf("%d", &a)

    if a%2 == 0 {
        fmt.Println("%d Is even number", a)
    } else {
        fmt.Println("%d is odd number", a)
    }
}

Explanation:

In Go, %d is a format specifier used for printing integers. However, when single quotes are used around it, Go interprets it as a rune literal. Since runes can only represent a single character, using %d within single quotes is incorrect.

To fix this issue, double quotes must be used around the format specifier to indicate that it is a string literal, not a rune literal. String literals can contain multiple characters, including format specifiers.

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