help in c with ascii

This is a discussion on help in c with ascii within the C Programming forums, part of the General Programming Boards category; good morning everyone I m working on a program in c and i want to check a string if all ...

  1. #1
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    help in c with ascii

    good morning everyone

    I m working on a program in c and i want to
    check a string if all characters are capitals and between A-Z(english).
    So the way i have to do it is by checking the ascii value of each character in the string given(ex str).

    Can anyone help me with this .??
    thank u very much..

    //admins sorry if i have posted in the wrong place//

  2. #2
    C++ Witch laserlight's Avatar
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    The standard header <ctype.h> provides an isupper() function that you may find handy.
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    If you give it a try then show us your code or errors then we could probably help better.

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    thank u very much..I ll try it later and i will return with code ..

  5. #5
    Registered User ssharish2005's Avatar
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    or u could do it manually

    Code:
    if( ch >= 65 && ch <= 90 )
    
    or
    
    if( ch >= 'A' && ch <= 'Z' )
    encapsulate this code with the function. And just call the function.

    ssharish

  6. #6
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    Quote Originally Posted by ssharish2005 View Post
    or u could do it manually

    Code:
    if( ch >= 65 && ch <= 90 )
    
    or
    
    if( ch >= 'A' && ch <= 'Z' )
    encapsulate this code with the function. And just call the function.

    ssharish
    Never do that. It isn't portable because it will only run on ASCII platforms.
    Even if your code is currently only running on an ASCII platform, you never know how long your code will survive and what platforms it will be ported to.

  7. #7
    C++まいる!Cをこわせ! Elysia's Avatar
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    How about unicode? Or maybe it isn't supported on all platforms?

  8. #8
    Registered User ssharish2005's Avatar
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    So just in curious which machine donst support ASCII?

    ssharish

  9. #9
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    Quote Originally Posted by ssharish2005 View Post
    So just in curious which machine donst support ASCII?

    ssharish
    z/OS Mainframes would be one.

  10. #10
    Algorithm Dissector iMalc's Avatar
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    Quote Originally Posted by ssharish2005 View Post
    So just in curious which machine donst support ASCII?

    ssharish
    More important question:
    How can somone looking at the code confirm that it is correct?
    Or
    In which piece of code is someone more likely to notice an off-by-one error?
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  11. #11
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    Hello again..
    thanks everyone for advise

    i m just wondering
    how the code from ssharish would work for the whole string(example given string saved in str variable)
    and
    what about using the function isupper();
    (to remember I want all letters in caps betweeen A-Z)!
    I 've never used this one.If anyone can give me an example for sth string str...
    and i think this can be in a new function so it will be called after user gives the phrase!..

    Thank u all

  12. #12
    and the hat of sweating
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    Use toupper() on each character in the string to convert to uppercase.

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