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Conversion dec to hex


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How do you see, whether a value has a decimal or hexadecimal representation? Most probably, it is stored in some form of binary in the memory. ;-)

But you can directly assign both hex literals (C++ feature) and hex strings (SystemC datatypes feature) to sc_uint variables:

#include <systemc.h>
int sc_main(int,char*[])
 sc_uint<32> pippo;
 // ...
 pippo =  0x2A;   // assign from hex literal
 pippo = "0x0A2"; // assign from hex string

 std::cout << pippo // decimal value by default
    << "="
    << pippo.to_string(SC_HEX) // SystemC hex representation
    << " (0x" << std::hex << pippo <<")" // C++ hex representation (with manual '0x' prefix)
    << std::endl;
 return 0;

Gotcha: In SystemC, hex strings are signed literals by default. When dealing with unsigned variables (sc_uint, et.al), you should make sure that the hex string contains a leading 0 to avoid unexpected sign extension, when converting from the hex string.

Greetings from Oldenburg,


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  • 9 years later...

Hello All ,

I have a similar question but for a bit vector :

sc_signal<sc_bv<40>> maddress ;

If I want to drive the addess value in hexadecimal to the input of the DUT based on previous feedback I should be able to assign it as below ?

maddress  = "0x8979E54200";

Also here a leading 0 is not required (as in the sc_uint case ?) due to it is a sc_bv type ?

Many thanks 

Regards Abdallah

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