Eroare de compilare: user.c:1:22: error: iostream.h: No such file or directory user.c: In function ‘main’: user.c:6: error: ‘f’ undeclared (first use in this function) user.c:6: error: (Each undeclared identifier is reported only once user.c:6: error: for each function it appears in.) user.c:8: error: redeclaration of ‘a’ with no linkage user.c:5: note: previous declaration of ‘a’ was here user.c:8: error: redeclaration of ‘b’ with no linkage user.c:5: note: previous declaration of ‘b’ was here user.c:13: error: expected expression before ‘.’ token