Eroare de compilare: user.c:1:2: error: invalid preprocessing directive #includefstream user.c:2: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'f' user.c:3: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'g' user.c: In function 'main': user.c:7: error: 'fn' undeclared (first use in this function) user.c:7: error: (Each undeclared identifier is reported only once user.c:7: error: for each function it appears in.) user.c:8: warning: suggest parentheses around assignment used as truth value user.c:9: error: 'fab' undeclared (first use in this function) user.c:11: error: 'ga' undeclared (first use in this function) user.c:19: error: 'gan' undeclared (first use in this function) user.c:23:7: warning: no newline at end of file