Compilare: user.c:2: warning: built-in function ‘exp’ declared as non-function user.c: In function ‘prod’: user.c:34: warning: ‘return’ with a value, in function returning void user.c: In function ‘main’: user.c:41: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:44: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result