Eroare de compilare: user.c:1:18: error: cstdio: No such file or directory user.c: In function 'citire': user.c:12: warning: implicit declaration of function 'scanf' user.c:12: warning: incompatible implicit declaration of built-in function 'scanf' user.c: In function 'scrie': user.c:30: warning: implicit declaration of function 'printf' user.c:30: warning: incompatible implicit declaration of built-in function 'printf' user.c: In function 'main': user.c:47: warning: implicit declaration of function 'freopen' user.c:47: error: 'stdin' undeclared (first use in this function) user.c:47: error: (Each undeclared identifier is reported only once user.c:47: error: for each function it appears in.) user.c:48: error: 'stdout' undeclared (first use in this function)