Eroare de compilare: user.c:1:19: error: fstream: No such file or directory user.c: In function ‘construire’: user.c:7: warning: suggest explicit braces to avoid ambiguous ‘else’ user.c: In function ‘main’: user.c:64: error: ‘ifstream’ undeclared (first use in this function) user.c:64: error: (Each undeclared identifier is reported only once user.c:64: error: for each function it appears in.) user.c:64: error: expected ‘;’ before ‘fin’ user.c:65: error: ‘fin’ undeclared (first use in this function) user.c:72: error: ‘ofstream’ undeclared (first use in this function) user.c:72: error: expected ‘;’ before ‘fout’ user.c:76: error: ‘fout’ undeclared (first use in this function)