Eroare de compilare: user.c: In function 'main': user.c:7: error: 'i' 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:7: error: 'j' undeclared (first use in this function) user.c:7: warning: left-hand operand of comma expression has no effect user.c:7: error: 'min' undeclared (first use in this function) user.c:7: warning: left-hand operand of comma expression has no effect user.c:7: error: 'len' undeclared (first use in this function) user.c:7: warning: left-hand operand of comma expression has no effect