string to hexadecimal

This is a discussion on string to hexadecimal within the C++ Programming forums, part of the General Programming Boards category; i need to convert a string to hexadecimal as follows : String : "12345678" needs to be converted to a ...

  1. #1
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    string to hexadecimal

    i need to convert a string to hexadecimal as follows :

    String : "12345678"
    needs to be converted to a
    Code:
     char value[4] = { '0x12' ,'0x34' , '0x56' , '0x78'};
    How Can that be done ?

    Thx

  2. #2
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    It appears you just did it

    Look up sscanf() format specifiers. %2x 4 times in the format string will do it.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  3. #3
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    Thx for the reply ,
    Actually i just wanted to show how i wanted the result to be. the actual string would be of variable length.so i need a function to transform the string characters to hexadecimal the way showed above.

  4. #4
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    As I said above, you can use sscanf() with an appropriate format string. In C++, a more idiomatic way would be to use string streams.

    I'll leave it as an exercise to work out how to turn a hex digit (in the range '0' to '9' or the range 'A' to 'F') to a numeric value (0x0 to 0x9 or 0xA to 0xF).
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

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