Converting Hex Strings to Signed Integers in C
Consider the task of converting a hex string representation of a number to a 32-bit signed integer. For instance, the hex string "fffefffe" translates to 11111111111111101111111111111110 in binary, representing the signed integer -65538. Additionally, we need to handle both positive and negative numbers, such as "0000000A" (binary: 00000000000000000000000000001010; decimal: 10).
Solution: Utilizing std::stringstream
Leveraging the std::stringstream class, the conversion process becomes straightforward:
unsigned int x; std::stringstream ss; ss > x;
By extracting the integer from the stream, we obtain the 32-bit signed integer representation of the hex string.
Alternative Approaches
Boost's lexical_cast: Handling Errors (Discontinued)
Note: As indicated in the source answer, Boost's lexical_cast approach has been discontinued in favor of the newer C 11 functions.
Boost also provides a convenient solution that incorporates error checking:
try { unsigned int x = lexical_cast<int>("0x0badc0de"); } catch(bad_lexical_cast &) { // Handle conversion error }</int>
Custom lexical_cast: Simple Implementation Without Error Checking
For those not utilizing Boost, a simplified version of lexical_cast can be employed without error handling:
template<typename t2 typename t1> inline T2 lexical_cast(const T1 &in) { T2 out; std::stringstream ss; ss > out; return out; } unsigned int x = lexical_cast<unsigned int>("0xdeadbeef");</unsigned></typename>
Conclusion
Employing either std::stringstream or the newer C 11 utilities (such as std::stol), developers can efficiently convert hex strings to signed integers in C .
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