Compilare: user.c: In function ‘main’: user.c:7: warning: passing argument 1 of ‘fscanf’ from incompatible pointer type /usr/include/stdio.h:425: note: expected ‘struct FILE * __restrict__’ but argument is of type ‘char *’ user.c:7: warning: passing argument 2 of ‘fscanf’ from incompatible pointer type /usr/include/stdio.h:425: note: expected ‘const char * __restrict__’ but argument is of type ‘long unsigned int *’ user.c:7: warning: format not a string literal and no format arguments user.c:17: warning: passing argument 1 of ‘fprintf’ from incompatible pointer type /usr/include/bits/stdio2.h:96: note: expected ‘struct FILE * __restrict__’ but argument is of type ‘char *’ user.c:17: warning: passing argument 2 of ‘fprintf’ makes pointer from integer without a cast /usr/include/bits/stdio2.h:96: note: expected ‘const char * __restrict__’ but argument is of type ‘long unsigned int’ user.c:18: warning: implicit declaration of function ‘system’ user.c:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result