{"post":"

Here, we are supposed to create a source code that asks for String input from the user and displays the string by changing the String’s Case to both UpperCase and LowerCase.

The basic idea is to change the input string’s case using ASCII Values.

The ASCII Values are:\nA-Z = 65 to 90\na-z = 97 to 122\n0-9 = 48 to 57

Algorithm(Convert lowercase to uppercase or uppercase to lowercase using ASCII)

Prompt the user to enter a string and store it in a variable.
Use a for loop to iterate through each character in the string.
Check if the character is a lowercase letter by comparing its ASCII value to the range 97-122. If it is, subtract 32 from its ASCII value and convert it back to a character. If it is an uppercase letter, check if its ASCII value is within the range of 65-90. If it is, add 32 to its ASCII value and convert it back to a character. Otherwise, leave the character unchanged.
Add the modified character to a separate string depending on whether it was originally uppercase or lowercase.
Display the final results by printing both strings.

Code

/* Program to enter a string and display in both UpperCase and LowerCase using ASCII Values.*/\n\nimport java.util.*;\n\nimport java.util.*;\n\nclass ChangeCase {\n  public static void main() {\n    Scanner scanner = new Scanner(System.in);\n    System.out.print(\"\\nEnter a string: \");\n    String inputString = scanner.nextLine();\n    int i, asciiValue;\n    char originalChar, modifiedChar;\n    String uppercaseString = \"\";\n    String lowercaseString = \"\";\n\n    // Loop to convert lowercase to uppercase\n    for (i = 0; i < inputString.length(); i++) {\n      originalChar = inputString.charAt(i);\n      asciiValue = (int) originalChar;\n      if (asciiValue >= 97 && asciiValue <= 122) {\n        asciiValue -= 32;\n        modifiedChar = (char) asciiValue;\n      } else {\n        modifiedChar = originalChar;\n      }\n      uppercaseString += modifiedChar;\n    }\n    System.out.println(\"\\nUppercase String: \" + uppercaseString);\n\n    // Loop to convert uppercase to lowercase\n    for (i = 0; i < inputString.length(); i++) {\n      originalChar = inputString.charAt(i);\n      asciiValue = (int) originalChar;\n      if (asciiValue >= 65 && asciiValue <= 90) {\n        asciiValue += 32;\n        modifiedChar = (char) asciiValue;\n      } else {\n        modifiedChar = originalChar;\n      }\n      lowercaseString += modifiedChar;\n    }\n    System.out.println(\"\\nLowercase String: \" + lowercaseString);\n  }\n}\n\n

Output:

Enter String: World Wide Web\n\nUpper Case: WORLD WIDE WEB\nLower Case: world wide web\n\n\nEnter String: Great Wall of China\n\nUpper Case: GREAT WALL OF CHINA\nLower Case: great wall of china\n

\n","title":"How to convert lowercase to uppercase in java using ASCII ?","authorDetails":{"name":"Neha Vishwakarma","slug":"neha-vishwakarma"},"description":"Learn to write a Java program to convert lowercase to uppercase or uppercase to lowercase using ASCII without using String function in java with code and output.","slug":"java/examples/java-program-to-convert-string-uppercase-and-lowercase-using-ascii+value","articleId":"636a83457bb1ce5072622c10","bookmarkStatus":{"isBookmarked":false,"bookmarkId":null}}