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Full Discussion: Logical Error With Type Conversion In C
Top Forums Programming Logical Error With Type Conversion In C Post 303021887 by Azrael on Monday 20th of August 2018 12:07:39 AM
Old 08-20-2018
Logical Error With Type Conversion In C
So, I'm into about 650 lines of some code I'm working on. So I'll try to explain instead of flooding this post. Say I have some code like this:

Code:
int main() {
    int i, j;
    char data[INPUT_BUFF];

    printf("Gimme something: ");
    fgets(data, INPUT_BUFF, stdin);

    for (j = 0; j < data[INPUT_BUFF]; j++){
    switch(data[j]){
    case 0: 
        if(j == 'e'){
            atoi(data);
            data[j] = ranit(e_array);
            sprintf( data, "%d", data );
        }
    case 1: 
        if(j == 'm'){
            atoi(data);
            data[j] = ranit(m_array);
            sprintf( data, "%d", data );
        }
    case 2: 
        if(j == 'n'){
            atoi(data);
            data[j] = ranit(n_array);
            sprintf( data, "%d", data );
        }
    case 3: 
        if(j == 'o'){
            atoi(data);
            data[j] = ranit(o_array);
            sprintf( data, "%d", data );
        }
    case 4: 
        if(j == 'y'){
            atoi(data);
            data[j] = ranit(y_array);
            sprintf( data, "%d", data );
        }

     }
     }

     for (i = 0; i < INPUT_BUFF; i++){
         printf("%x\n", (int)data[(int)i]);
     }

     return 0;
}

I have a switch statement in the above that only checks for the characters in the word 'money'. The entire alphabet would have been too much to put here. The function ranit() grabs a random element out of the array it is past. That function has been checked and works perfect. In the case all the elements are numbers. I've tried to do this a lot of different ways, but what I want to do is after checking for a matching character, replace it with a random element in from the corresponding arrays that contain integers.

I tried using atoi() to make the 'data' character array able to hold integers. That way I wouldn't get an error about mismatching types. At some point I could have sworn itoa worked with gcc, but I now see this is no longer part of the standard library. I tried using sprintf() to convert the data array back to chars for the next iteration of the loop.

When I run the code I notice the random numbers aren't displayed, but the hex equivalents for the ascii values of the word 'money':

Code:
$ ./test 
Gimme something: money
6d
6f
6e
65
79

I'm unsure if I'm assigning the values wrong or if sprintf won't allow for the same source and destination values. All the examples I found would put this in a new variable or array name, but I need to have it in the same for the next loop iteration. So maybe I should be using something else?

No warnings or errors from the compiler. Just strictly a logical error at this point. Any suggestions much appreciated.
 

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LEARN ABOUT SUNOS

iconv_zh_tw

iconv_zh_TW(5)							File Formats Manual						    iconv_zh_TW(5)

NAME

       iconv_zh_TW - code set conversion tables in traditional Chinese (zh_TW) locale

AVAILABILITY

       SUNWhleu

DESCRIPTION

       The following code set conversions are supported:

		  Code Set Conversions Supported
       Code	       Symbol		    TargetCode	    Symbol

       CNS 11643       zh_TW-euc	    Big-5	    zh_TW-big5
       CNS 11643       zh_TW-euc	    ISO 2022-7	    zh_TW-iso2022-7
       CNS 11643       zh_TW-euc	    UTF-8	    UTF-8
       CNS 11643       zh_TW-euc	    IS0 2022-CN-EXT zh_TW-iso2022-CN-EXT
       Big-5	       zh_TW-big5	    CNS 11643	    zh_TW-euc
       Big-5	       zh_TW-big5	    ISO 2022-7	    zh_TW-iso2022-7
       Big-5	       zh_TW-big5	    IS0 2022-CN-EXT zh_TW-is02022-CN-EXT
       Big-5	       zh_TW-big5	    UTF-8	    UTF-8
       ISO 2022-7      zh_TW-iso2022-7	    CNS 11643	    zh_TW-euc
       ISO 2022-7      zh_TW-iso2022-7	    Big-5	    zh_TW-big5
       IS0 2022-7      zh_TW-iso2022-7	    UTF-8	    UTF-8
       IS0 2022-CN-EXT zh_TW-iso2022-CN-EXT CNS 11643	    zh_TW-euc
       IS0 2022-CN-EXT zh_TW-iso2022-CN-EXT Big-5	    zh_TW-big5
       Code Page 937   zh_TW-cp937	    UTF-8	    UTF-8
       BIG5HK	       zh_HK-big5hk	    UTF-8	    UTF-8
       Big-5p	       zh_TW-big5p	    UTF-8	    UTF-8
       UTF-8	       UTF-8		    CNS 11643	    zh_TW-euc
       UTF-8	       UTF-8		    IS0 2022-7	    zh_TW-iso2022-7
       UTF-8	       UTF-8		    Big-5	    Big-5
       UTF-8	       UTF-8		    Code Page 937   zh_TW-cp937
       UTF-8	       UTF-8		    BIG5HK	    zh_HK-big5hk
       UTF-8	       UTF-8		    Big-5p	    zh_TW-big5p

       Conversions  are  performed  as described below. For all conversions, if the source code set includes characters not included in the target
       code set, conversion and output for all such characters will be done using a substitute characters.

zh_TW-euc to UTF-8 and UTF-8 to zh_TW-euc
       Conversion modules are provided to convert CNS 11643 plane 1, 2 and 3 characters between EUC-TW and UTF-8 encodings. If	input  data  which
       does  not  belong  to the above charset is encountered, it will be replaced with the substitute character (zh_TW-euc: '??' (0x3f3f), UTF-8:
       U+FFFD (0xefbfbd)).

zh_TW-euc to zh_TW-big5 and zh_TW-big5 to zh_TW-euc
       Conversion modules can be used to convert CNS 11643 plane 1 and 2 characters between EUC-TW and BIG5 encodings. If input  data  which  does
       not  belong  to	the  above charset is encountered, it will be replaced with the subsitute character (zh_TW-euc: '__' (0x5f5f), zh_TW-big5:
       '__' (0x5f5f)).

       Note that the seven additional popular characters from ETen extension have been supported, they belong to CNS 11643 plane 3.

zh_TW-euc to zh_TW-iso2022-7 and zh_TW-iso2022-7 to zh_TW-euc
       Conversion modules can be used to convert CNS 11643 characters between EUC-TW and ISO-2022-7 encodings.

zh_TW-euc to zh_TW-iso2022-CN-EXT and zh_TW-iso2022-CN-EXT to zh_TW-euc
       Conversion modules can be used to convert GB 2312-80, CNS 11643 plane 1, 2, 3, 4, 5, 6 and 7 characters between EUC-TW and  IS0-2022-CN-EXT
       encodings.

zh_TW-big5 to UTF-8 and UTF-8 to zh_TW-big5
       Conversion  modules  are  provided to convert Big-5 characters between BIG5 and UTF-8 encodings. If input data which does not belong to the
       above charset is encountered, it will be replaced with the substitute character (zh_TW-big5: '??' (0x3f3f), UTF-8: U+FFFD (0xefbfbd)).

       Note that the seven additional popular characters from ETen extension have been supported, they are 0xf9d6 -- 0xf9dc.

zh_TW-big5 to zh_TW-iso2022-7 and zh_TW-iso2022-7 to zh_TW-big5
       Conversion modules can be used to convert Big-5 characters between BIG5 and ISO-2022-7 encodings. If input Big-5 data which does  not  have
       corresponding CNS 11643 character is encountered, it will be replaced with the substitute character (zh_TW-iso2022-7: '__' (0x5f5f)).

zh_TW-big5 to zh_TW-iso2022-CN-EXT and zh_TW-iso2022-CN-EXT to zh_TW-big5
       Conversion  modules are provided to convert Big-5 characters between BIG5 and ISO-2022-CN-EXT encodings. If input Big-5 data which does not
       have corresponding CNS 11643 character is encountered, it will be replaced with the substitute character (zh_TW-iso2022-7: '__' (0x5f5f)).

zh_TW-big5p to UTF-8 and UTF-8 to zh_TW-big5p
       Conversion modules can be used to convert Big-5p characters between BIG5+ and UTF-8 encodings. If input data which doesn't  belong  to  the
       above charset is encountered, it will be replaced with the substitute character (zh_TW-big5p: '??' (0x3f3f), UTF-8: U+FFFD).

zh_HK-big5hk to UTF-8 and UTF-8 to zh_HK-big5hk
       Conversion modules can be used to convert HKSCS and Big-5 characters between BIG5HK and UTF-8 encoding. If input data which does not belong
       to the above charsets is encountered, it will be replaced with the substitute character (zh_HK-big5hk: '??' (0x3f3f), UTF-8: U+FFFD).

zh_TW-cp937 to UTF-8 and UTF-8 to zh_TW-cp937
       Conversion modules are provided to convert CNS 11643 characters between IBM Code Page 937 and UTF-8 encodings.

zh_TW-iso2022-7 to UTF-8 and UTF-8 to zh_TW-iso2022-7
       Conversion modules can be used to convert CNS 11643 characters between ISO-2022-7 and UTF-8 encodings.

SEE ALSO

       iconv(1), iconv(3), iconv(5), iconv_zh(5)

								    2 Nov 2001							    iconv_zh_TW(5)
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