Program to Replace Lower-Case Characters with Upper-Case and Vice Versa

Q. Program to replace lower-case characters with upper-case and vice versa.

Here, our task is to replace all the lower-case characters in the string to upper-case and upper-case characters to lower-case. For this purpose, we need to traverse the string and check for each character. If the character is a lower-case character, make it upper-case by using the language-specific built-in method or add 32 to the lower-case character in C to change the ASCII value of the character.

Algorithm

Define a string and traverse through it.
If the lower-case character is encountered then convert them in upper case character using built-in function.
If the upper-case character is encountered then convert them in upper case character using built-in function.
If it’s a character other than upper-case or lower-case alphabet take the character as it is.

Solution

Python

  str1=”Great Power”;  newStr = “”;     for i in range(0, len(str1)):      #Checks for lower case character      if str1[i].islower():          #Convert it into upper case using upper () function          newStr += str1[i].upper();      #Checks for upper case character      elif str1[i].isupper():          #Convert it into lower case using lower () function          newStr += str1[i].lower();            else:          newStr += str1[i];          print(“String after case conversion : ” +  newStr);  

Output:

String after case conversion : gREAT pOWER

C

  #include <stdio.h>  int main()  {      int i, len = 0;      char str[] = “Great Power”;            //Calculating length of the array      len = sizeof(str)/sizeof(str[0]);            //Checks every character in the array      for(i = 0; i < len; i++){                    //Checks whether a character is upper case character          if(isupper(str[i])){              //Convert that charcter to lower case              str[i] = tolower(str[i]);          }          //Checks whether a character is lower case character          else if(islower(str[i])){              //Convert that charcter to upper case              str[i] = toupper(str[i]);          }      }      printf(“String after case conversion : %s”, str);      return 0;  }  

Output:

String after case conversion : gREAT pOWER

JAVA

  public class changeCase {      public static void main(String[] args) {                    String str1=”Great Power”;          StringBuffer newStr=new StringBuffer(str1);                    for(int i = 0; i < str1.length(); i++) {                            //Checks for lower case character              if(Character.isLowerCase(str1.charAt(i))) {                  //Convert it into upper case using toUpperCase() function                  newStr.setCharAt(i, Character.toUpperCase(str1.charAt(i)));              }              //Checks for upper case character              else if(Character.isUpperCase(str1.charAt(i))) {                  //Convert it into upper case using toLowerCase() function                  newStr.setCharAt(i, Character.toLowerCase(str1.charAt(i)));              }          }          System.out.println(“String after case conversion : ” + newStr);      }  }  

Output:

String after case conversion : gREAT pOWER

C#

  using System;  public class Program  {      public static void Main()      {          string str1=”Great Power”;          char ch;          System.Text.StringBuilder str2 = new System.Text.StringBuilder();             for(int i = 0; i < str1.Length; i++) {              //Checks for lower case character              if(char.IsLower(str1[i])) {                  //Convert it into upper case using ToUpper() function                  ch = Char.ToUpper(str1[i]);                  //Append that character to new character                  str2.Append(ch);              }              //Checks for lower case character              else if(char.IsUpper(str1[i])) {                  //Convert it into lower case using ToLower() function                  ch = Char.ToLower(str1[i]);                  //Append that character to new character                  str2.Append(ch);              }              else{                  ch = str1[i];                  str2.Append(ch);              }          }          Console.WriteLine(“String after case conversion : ” + str2);      }  }  

Output:

String after case conversion : gREAT pOWER

PHP

  <!DOCTYPE html>  <html>  <body>  <?php      $str1 = “Great Power”;      for($i = 0; $i < strlen($str1); $i++){          //Checks for lower case character          if($str1[$i] >= ‘a’ && $str1[$i] <= ‘z’){              //Convert it into upper case using strtoupper() function              $str1[$i] = strtoupper($str1[$i]);          }          //Checks for lower case character          elseif($str1[$i] >= ‘A’ && $str1[$i] <= ‘Z’){              //Convert it into upper case using strtolower() function              $str1[$i] = strtolower($str1[$i]);          }      }  echo “String after case conversion : $str1”;  ?>  </body>  </html>  

Output:

String after case conversion : gREAT pOWER

Next TopicPrograms List

Q. Program to replace lower-case characters with upper-case and vice versa.

Algorithm

Solution

Python

C

JAVA

C#

PHP

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