Golang program that uses switch, multiple value cases - GeeksforGeeks

10 May, 2020
Switch statement is a multiway branching which provides an alternative way too lengthy if-else comparisons. It selects a single block to be executed from a listing of multiple blocks on the basis of the value of an expression or state of a single variable. A switch statement using multiple value cases correspond to using more than one value in a single case. This is achieved by separating the multiple values in the case with a comma.
Example 1:
// Golang program to illustrate the// use of switch with multiple value casespackage main  import (    "fmt")  func main() {      // string to input month from user    var month string    fmt.Scanln(&month)      // switch case for predicting    // seasons for month entered          // each switch case has more     // than one values    switch month {        case "january", "december":            fmt.Println("Winter.")        case "february", "march":            fmt.Println("Spring.")        case "april", "may", "june":            fmt.Println("Summer.")        case "july", "august":            fmt.Println("Monsoon.")        case "september", "november":            fmt.Println("Autumn.")    }}
Input : january
Output : Winter.

Input : september
Output : Autumn.

Rather than making different individual cases for months having the same season, we clubbed different months with the same output. This saves us to write redundant pieces of code.
Example 2:
// Golang program to illustrate the// use of switch with multiple value casespackage main  import (    "fmt")  func main() {      // integer to input number from     // user (only 1-10)    var number int    fmt.Scanln(&number)      // switch case for predicting    // whether the number is even or odd          // each switch case has more     // than one values    switch number {        case 2, 4, 6, 8, 10:            fmt.Println("You entered an even number.")        case 1, 3, 5, 7, 9:                fmt.Println("You entered an odd number.")    }}
Input : 6
Output : You entered an even number.

Input : 5
Output : You entered an odd number.

Instead of writing 10 different cases to check whether the entered number is even or not, we could simply do the same in 2 switch cases using multiple case values.
Example 3:
// Golang program to illustrate the// use of switch with multiple value casespackage main  import (    "fmt")  func main() {      // character input (a-z or A-Z)    var alphabet string    fmt.Scanln(&alphabet)      // switch case for predicting    // whether the character is    // uppercase or lowercase          // each switch case has more     // than one values    switch alphabet {        case "a", "b", "c", "d", "e", "f", "g", "h", "i",        "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t",        "u", "v", "w", "x", "y", "z":            fmt.Println("Lowercase alphabet character.")                      case "A", "B", "C", "D", "E", "F", "G", "H", "I", "J",        "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T",        "U", "V", "W", "X", "Y", "Z":            fmt.Println("Uppercase alphabet character.")    }}
Input : g
Output : Lowercase alphabet character.

Input : F
Output : Uppercase alphabet character.

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