function

This is a discussion on function within the C Programming forums, part of the General Programming Boards category; There is a function again. I have no idea to do that. Write a function which copies a string into ...

  1. #1
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    Talking function

    There is a function again. I have no idea to do that.

    Write a function which copies a string into a new string(allocation new memory in the process)such that any lower case characters are converted to upper case(all other characters are coped unaltered) and returns a pointer to that string. The prototype is :

    char *strupper(const char *lower);

    I know how to allocate memory to something.
    but I am little bit confuse that char *strupper(...)
    Does it mean that it will return a pointer?

    how to achieve it?

  2. #2
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    Thumbs up Re: function

    Originally posted by Tombear
    There is a function again. I have no idea to do that.

    Write a function which copies a string into a new string(allocation new memory in the process)such that any lower case characters are converted to upper case(all other characters are coped unaltered) and returns a pointer to that string. The prototype is :

    char *strupper(const char *lower);

    I know how to allocate memory to something.
    but I am little bit confuse that char *strupper(...)
    Does it mean that it will return a pointer?

    how to achieve it?
    hi tombear,

    exactly it will return, if u use the below statement---

    return *string;

    here the variable 'string' must store the value of 'lower'.
    Jackie

  3. #3
    Registered User C_Coder's Avatar
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    if you return a pointer to a string in a function you need to declare the string as static otherwise it will be lost when the function returns and you will have a pointer to nothing.
    All spelling mistakes, syntatical errors and stupid comments are intentional.

  4. #4
    and the hat of wrongness Salem's Avatar
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    It goes like this
    Code:
    char *strlower ( char *text ) {
        char *result = malloc( strlen(text) + 1 );
        if ( result == NULL ) return NULL;
        // do the actions asked
        return result;
    }
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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