Compilare: user.c: In function ‘calculare’: user.c:35: warning: unused variable ‘rez’ user.c: In function ‘main’: user.c:52: warning: implicit declaration of function ‘pow’ user.c:52: warning: incompatible implicit declaration of built-in function ‘pow’ user.c:52: warning: overflow in implicit constant conversion user.c:53: warning: implicit declaration of function ‘strlen’ user.c:53: warning: incompatible implicit declaration of built-in function ‘strlen’ user.c:46: warning: unused variable ‘t’ user.c:49: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:52: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result