Eroare de compilare: user.c:1:17: error: cstdio: No such file or directory user.c:2:16: error: cmath: No such file or directory user.c: In function ‘free’: user.c:5: warning: number of arguments doesn’t match built-in prototype user.c:9: warning: implicit declaration of function ‘sqrt’ user.c:9: warning: incompatible implicit declaration of built-in function ‘sqrt’ user.c:18: warning: implicit declaration of function ‘printf’ user.c:18: warning: incompatible implicit declaration of built-in function ‘printf’ user.c: In function ‘main’: user.c:22: warning: implicit declaration of function ‘freopen’ user.c:22: error: ‘stdin’ undeclared (first use in this function) user.c:22: error: (Each undeclared identifier is reported only once user.c:22: error: for each function it appears in.) user.c:23: error: ‘stdout’ undeclared (first use in this function) user.c:24: warning: implicit declaration of function ‘scanf’ user.c:24: warning: incompatible implicit declaration of built-in function ‘scanf’