Eroare de compilare: user.cpp: In function ‘int sum(int)’: user.cpp:12:12: warning: right operand of comma operator has no effect [-Wunused-value] for (i=1,i<=n,i++) ^ user.cpp:12:19: error: expected ‘;’ before ‘)’ token for (i=1,i<=n,i++) ^ user.cpp:17:2: error: expected primary-expression before ‘return’ return s; ^ user.cpp:17:2: error: expected ‘;’ before ‘return’ user.cpp:17:2: error: expected primary-expression before ‘return’ user.cpp:17:2: error: expected ‘)’ before ‘return’ user.cpp:11:12: warning: unused variable ‘p’ [-Wunused-variable] int i,s=0,p=1; ^ user.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type] } ^