Swift Program to Convert a String to Uppercase

This tutorial will discuss how to write swift program to convert a string to uppercase.

A string is a sequence of characters for example, “RedCar”. Or we can say, string are used to represent textual data. Swift support a String data type which is used to create a String type variable, or we can say to represent strings.

To convert the given string into uppercase Swift provide a in-built function named uppercased(). The uppercased() function is used to convert all the characters(either in lowercase or in uppercase or in both) of the given string into uppercase. This function does not take any parameter.

Below is a demonstration of the same −

Input

Suppose our given input is −

MyStr = “Hello! ToM”

Output

The desired output would be −

Lowercased string = “HELLO! TOM”

Syntax

Following is the syntax −

stringName.uppercased()

Algorithm

Following is the algorithm −

• Step 1− Create string with value

• Step 2− Convert the string into uppercase using uppercased() function −

var lowerStr = String.uppercased()

• Step 3− Display the output

Convert a string to uppercase

Example

The following program shows how to convert a string to uppercase.

import Foundation
import Glibc

var String1 = "CaR iS In BlUe"
var String2 = "ITS RAINING TODAY"
var String3 = "i love icecreame"

// Convert to uppercase
var upperStr1 = String1.uppercased()
var upperStr2 = String2.uppercased()
var upperStr3 = String3.uppercased()

print("Original String:", String1)
print("Uppercase String:", upperStr1)

print("\nOriginal String:", String2)
print("Uppercase String:", upperStr2)

print("\nOriginal String:", String3)
print("Uppercase String:", upperStr3)

Output

Original String: CaR iS In BlUe
Uppercase String: CAR IS IN BLUE

Original String: ITS RAINING TODAY
Uppercase String: ITS RAINING TODAY

Original String: i love icecreame
Uppercase String: I LOVE ICECREAME

Here, in the above code, we have three strings named String1, String2, and String3. Now we convert them in uppercase using uppercased() function −

var upperStr1 = String1.uppercased() // Return CAR IS IN BLUE
var upperStr2 = String2.uppercased() // Return ITS RAINING TODAY
var upperStr3 = String3.uppercased() // Return I LOVE ICECREAME

Compare two strings using uppercased()

Example 

The following program shows how to compare two strings using uppercased() function.

import Foundation
import Glibc

var String1 = "CaR iS REd"
var String2 = "car is Pink"

print("String 1 =",String1,"\nString 2",String2)
// Comparing two strings
if (String1.uppercased() == String2.uppercased()){
   print("String1 and String2 are equal")
}
else{
   print("String1 and String2 are not equal")
}

Output

String 1 = CaR iS REd
String 2 car is Pink
String1 and String2 are not equal

Here, in the above code, we have two strings named: String1 and String2. Now we check if both the strings are equal or not. So we convert the given strings into uppercase using uppercased() function and then using == we check both are equal or not −

if (String1.uppercased() == String2.uppercased()){
   print("String1 and String2 are equal")
}
else{
   print("String1 and String2 are not equal")
}

Here both the strings are not equal so we get an output: String1 and String2 are not equal.