Check If the Rune is an Uppercase Letter or not in Golang Last Updated : 27 Sep, 2019 Comments Improve Suggest changes Like Article Like Report Rune is a superset of ASCII or it is an alias of int32. It holds all the characters available in the world's writing system, including accents and other diacritical marks, control codes like tab and carriage return, and assigns each one a standard number. This standard number is known as a Unicode code point or rune in the Go language. You are allowed to check the given rune is an upper case letter or not with the help of IsUpper() function. This function returns true if the given rune is an upper case letter, or return false if the given rune is not an upper case letter. This function is defined under Unicode package, so for accessing this method you need to import the Unicode package in your program. Syntax: func IsUpper(r rune) bool The return type of this function is boolean. Let us discuss this concept with the help of given examples: Example 1: C // Go program to illustrate how to check // the given rune is an uppercase letter // or not package main import ( "fmt" "unicode" ) // Main function func main() { // Creating rune rune_1 := 'g' rune_2 := 'e' rune_3 := 'E' rune_4 := 'k' rune_5 := 'S' // Checking the given rune is // an upper case letter or not // Using IsUpper() function res_1 := unicode.IsUpper(rune_1) res_2 := unicode.IsUpper(rune_2) res_3 := unicode.IsUpper(rune_3) res_4 := unicode.IsUpper(rune_4) res_5 := unicode.IsUpper(rune_5) // Displaying results fmt.Println(res_1) fmt.Println(res_2) fmt.Println(res_3) fmt.Println(res_4) fmt.Println(res_5) } Output: false false true false true Example 2: C // Go program to illustrate how to check // the given rune is an Uppercase letter // or not package main import ( "fmt" "unicode" ) // Main function func main() { // Creating a slice of rune val := []rune{'g', 'E', 'e', 'K', 's'} // Checking each element of the given // slice of the rune is an uppercase // letter or not // Using IsUpper() function for i := 0; i < len(val); i++ { if unicode.IsUpper(val[i]) == true { fmt.Printf("\n%c is an uppercase letter", val[i]) } else { fmt.Printf("\n%c is not an uppercase letter", val[i]) } } } Output: g is not an uppercase letter E is an uppercase letter e is not an uppercase letter K is an uppercase letter s is not an uppercase letter Comment More infoAdvertise with us Next Article Check If the Rune is a Decimal Digit or not in Golang A ankita_saini Follow Improve Article Tags : Go Language Golang Similar Reads Check If the Rune is a Letter or not in Golang Rune is a superset of ASCII or it is an alias of int32. It holds all the characters available in the world's writing system, including accents and other diacritical marks, control codes like tab and carriage return, and assigns each one a standard number. This standard number is known as a Unicode c 2 min read Check If the Rune is a Lowercase Letter or not in Golang Rune is a superset of ASCII or it is an alias of int32. It holds all the characters available in the world's writing system, including accents and other diacritical marks, control codes like tab and carriage return, and assigns each one a standard number. This standard number is known as a Unicode c 2 min read Check If the Rune is a Decimal Digit or not in Golang Rune is a superset of ASCII or it is an alias of int32. It holds all the characters available in the world's writing system, including accents and other diacritical marks, control codes like tab and carriage return, and assigns each one a standard number. This standard number is known as a Unicode c 2 min read Check If the Rune is a Space Character or not in Golang Rune is a superset of ASCII or it is an alias of int32. It holds all the characters available in the world's writing system, including accents and other diacritical marks, control codes like tab and carriage return, and assigns each one a standard number. This standard number is known as a Unicode c 2 min read Check If the Rune is a Symbolic Character or not in Golang Rune is a superset of ASCII or it is an alias of int32. It holds all the characters available in the world's writing system, including accents and other diacritical marks, control codes like tab and carriage return, and assigns each one a standard number. This standard number is known as a Unicode c 1 min read Check If the Rune is a Unicode Punctuation Character or not in Golang Rune is a superset of ASCII or it is an alias of int32. It holds all the characters available in the world's writing system, including accents and other diacritical marks, control codes like tab and carriage return, and assigns each one a standard number. This standard number is known as a Unicode c 2 min read Like