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const int ERROR = -1;

int something(){
return ERROR;
}

int main(int argc, char* argv[])
{
something();
return 0;
}

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const int ERROR = -1;

int something(){
return ERROR;
}

int main(int argc, char* argv[])
{
int check = something();

if(check == ERROR){
cout << "Error occured";
}

return 0;
}