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C++ code file extension? What is the difference between . cc and . cpp 95 cpp is the recommended extension for C++ as far as I know Some people even recommend using hpp for C++ headers, just to differentiate from C Although the compiler doesn't care what you do, it's personal preference
What is the lt;= gt; (spaceship, three-way comparison) operator in C++? This is called the three-way comparison operator According to the P0515 paper proposal: There’s a new three-way comparison operator, <=> The expression a <=> b returns an object that compares <0 if a < b, compares >0 if a > b, and compares ==0 if a and b are equal equivalent To write all comparisons for your type, just write operator<=> that returns the appropriate category type: Return
Why are #ifndef and #define used in C++ header files? I have been seeing code like this usually in the start of header files: #ifndef HEADERFILE_H #define HEADERFILE_H And at the end of the file is #endif What is the purpose of this?
Run C++ in command prompt - Windows - Stack Overflow Syntax is just gcc my_source_code cpp, or gcc -o my_executable exe my_source_code cpp It gets more complicated, of course, when you have multiple source files (as in implementation; anything #include d works automatically as long as GCC can find it) MinGW appears to be a version of GCC for Windows, if that's what you're using
How can I convert int to string in C++? - Stack Overflow itoa will be faster than the stream equivalent There are also ways of re-using the string buffer with the itoa method (avoiding heap allocations if you are frequently generating strings e g for some rapidly updating numerical output) Alternatively you can generate a custom streambuf to reduce some of the allocation overhead etc Constructing the stream in the first place is also not a low