Compilare: user.c:10: warning: return type defaults to ‘int’ user.c: In function ‘main’: user.c:16: warning: format ‘%d’ expects type ‘int *’, but argument 3 has type ‘long int *’ user.c:14: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:16: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:18: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:31: warning: control reaches end of non-void function