Compilare: user.c: In function ‘citire’: user.c:19: warning: implicit declaration of function ‘calloc’ user.c:19: warning: incompatible implicit declaration of built-in function ‘calloc’ user.c:14: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:17: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c: In function ‘main’: user.c:53: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’ user.c:57: warning: implicit declaration of function ‘system’