How to convert char to hex

I want to create a program where a user inputs some numbers and code is capable of adding those number by first converting them into hexadecimal character and then the addition procedure is executed. I know this sounds really awkward but I want to do this via programming. Is this possible? Can I convert char value to hex and then add them?

Code:

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char *HexStringConversion (char *hStr)
{
char *str = new char[(strlen(hStr)*2)+1];
char *str1 = hStr;
char *str2 = str;

while('\0' != *str1)
{
sprintf(str2, "%02X", (char)(*str1++));
str2+=2;
}
*(str2) = '\0';
return(str);
}

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You can call the above function to convert your characters or strings into hexadecimal number and then add them in your main as normally you would do.

There is no need of any functions if you are doing so in C language. All you need to do is except the number and then display it using "%x". You can even manipulate with this value if you want.

Code:

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# include <stdio.h>
# include <conio.h>

int main()
{
    clrscr();
    char chr[15];
    scanf ("%s", &chr);
    printf ("%x\n", chr[0]);
    getch();
    return 0;
}

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The C++ code goes as below:

Code:

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# include <iostream.h>
static const char HexToAsciiValue[256][2] = { {'0','0'}, {'0','1'}, .... {'F','E'},{'F','F'} };
string CharToHex (const unsigned char* pArray, unsigned int strLen)
{
    string str;
    str.resize (strLen*2);
    char* pszHex = &str[0];
    const unsigned char* pEnd = pArray + strLen;
    for (const unsigned char* pChar = pArray; pChar != pEnd; pChar++, pszHex += 2 ) {
        pszHex[0] = HexToAsciiValue[*pChar][0];
        pszHex[1] = HexToAsciiValue[*pChar][1];
    }
    return str;
}

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