Java Program to test if a character is uppercase lowercase number vowel

Question

As I said before  how do I test if the entered character is one of the parameters  I ve written this code  but it doesn t seem to run very well or at all   no errors  however  Also  I need to use the basic code I ve used here  Its for school and we lose points if we use things they haven t taught us  darn school     class doody      public static void main String   args      char i      char input  D        for i  A  i lt   Z  i     check if uppercase               if input  i               System out println  Uppercase                switch input               case  A               case  E               case  I               case  O               case  U                   System out println  Vowel    break              default  System out println  Not a vowel    break                          for i  a  i lt   z  i     check if lowercase                       if input  i                   System out println  Lowercase                    switch input                   case  a                   case  e                   case  i                   case  o                   case  u                   System out println  Vowel    break                  default  System out println  Not a vowel    break                               for i  0  i lt   9  i     check if number                       if input  i                  System out println  Number                            Edit  Here is some code I threw together today  Much simpler  I don t know why this didn t occur to me earlier  It was probably because I was groggy  it was late   class doody    public static void main String   args           char input       input here       boolean lorn false      if input gt   a  amp  amp input lt   z            System out println  Lowercase                lorn true          if input   a  System out println  Vowel             if input   e  System out println  Vowel             if input   i  System out println  Vowel             if input   o  System out println  Vowel             if input   u  System out println  Vowel                    if input gt   A  amp  amp input lt   Z            System out println  Uppercase                lorn true          if input   A  System out println  Vowel             if input   E  System out println  Vowel             if input   I  System out println  Vowel             if input   O  System out println  Vowel             if input   U  System out println  Vowel                    if input gt   0  amp  amp input lt   9                         lorn true              System out println  Number                   if lorn  false System out println  It is a special character

User · Answer

In Java   Character class has static method called isLowerCase Char ch  ans isUpperCase Char ch    Character isDigit Char ch gives you Boolean value  base on that you can easily achieve your task  example    String abc    HomePage    char ch   abc charAt i      here i  1 2 3        if Character isLowerCase ch           do something    ch is in lower case    if Character isUpperCase ch           do something   ch is in Upper case    if Character isDigit ch          do something   ch is in Number   Digit

User · Answer

You appear to have upper and lowercase back to front  A-Z would be upper  a-z would be lower  While not exactly efficient - with the inverted case exception  I think it should output correctly

User · Answer

Char input    if  input matches    a-zA-Z                if  Character isLowerCase input                     lowercase              else                    uppercase              if  input matches    aeiouAEIOU                         vowel             else                     consonant            else if  input matches    0  1-9  0-9                     number     else            invalid

User · Answer

Some comments on your code   why would you want to have 2 for loops like for i  A  i lt   Z  i     if you can check this with a simple if statement     you loop over a whole range while you can simply check whether it is contained in that range even when you found your answer  for example when input is A you will have your result the first time you enter the first loop  you still loop over all the rest your System out println  Lowercase    statement  and the uppercase statement  are placed in the wrong loop If you are allowed to use it  I suggest to look at the Character class which has for example nice isUpperCase and isLowerCase methods   I leave the rest up to you since it is homework

User · Answer

This is your homework  so I assume you NEED to use the loops and switch statments  That s O K  but why are all your loops inner to the privious ones    Just take them out to the same  level  and your code is just fine   part to the low up mixup    A tip  Pressing extra  Enter   amp   Space  is free   That s the first thing I did to your code  and the problem became very trivial

User · Answer

This may not be what you are looking for but I thought you oughta know the real way to do this  You can use the java lang Character class s isUpperCase   to find aout about the case of the character  You can use isDigit   to differentiate between the numbers and letters This is just FYI       You can then do a toUpperCase   and then do the switch for vowels  This will improve your code quality

User · Answer

You don t need a for loop in your code   Here is how you can re implement your method   If input is between  A  and  Z  its uppercase If input is between  a  and  z  its lowercase If input is one of  a e i o u A E I O U  its Vowel Else Consonant     Edit   Here is hint for you to proceed  Following code snippet gives int values for chars  System out println  a    int  a    System out println  z    int  z    System out println  A    int  A    System out println  Z    int  Z      Output  a 97 z 122 A 65 Z 90   Here is how you can check if a number x exists between two numbers say a and b     x greater than or equal to a and x less than or equal to b if   x  gt   a  amp  amp  x  lt   b      During comparisons chars can be treated as numbers  If you can combine these hints  you should be able to find what you want

User · Answer

If it weren t a homework  you could use existing methods such as Character isDigit char   Character isUpperCase char  and Character isLowerCase char  which are a bit  smarter   because they don t operate only in ASCII  but also in various charsets   static final char   VOWELS      a    e    i    o    u    A    E    I    O    U      static boolean isVowel char ch        for  char vowel   VOWELS            if  vowel    ch                return true                      return false     static boolean isDigit char ch        return ch  gt    0   amp  amp  ch  lt    9      static boolean isLowerCase char ch        return ch  gt    a   amp  amp  ch  lt    z      static boolean isUpperCase char ch        return ch  gt    A   amp  amp  ch  lt    Z

[java] Java Program to test if a character is uppercase/lowercase/number/vowel

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