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compile c++ gcc online

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Compilation time: 0.32 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 4 Mb, absolute service time: 0.48 sec 
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Warning(s):
source_file.cpp: In function ‘int main()’:
source_file.cpp:23:13: warning: variable ‘ex’ set but not used [-Wunused-but-set-variable]
     example ex = 10;
             ^
Hello, world!
ctor with params