C program to change case of string

In this post, you learn how to change the case of string. If you entered "A", the program will change it's case to "a" and vise-versa. Refer following examples:

#Example: Uppercase to Lowercase (strlwr)

  
  #include <stdio.h>
  #include <string.h>
  void main()
  {
     char inpString[1000];
     char lwrString[1000];
     
     printf("Enter a string to convert to lower case:\n");
     gets(inpString);
     lwrString = strlwr(inpString);
 
     printf("Your string in lower case: \"%s\"\n",lwrString);
 
  }

Output

  Enter a string to convert to lower case:
  HELLO
  Your string in lower case:
  hello

#Example: Lowercase to Uppercase (strupr)

  #include <stdio.h>
  #include <string.h>
  void main()
  {
     char inpString[1000];
     char uprString[1000];
     
     printf("Enter a string to convert to upper case:\n");
     gets(inpString);
     uprString = strlwr(inpString);
 
     printf("Your string in upper case: \"%s\"\n",uprString);
 
  }

Output

  Enter a string to convert to upper case:
  hello
  Your string in upper case:
  HELLO