Compilare: user.c: In function ‘main’: user.c:20:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a); ^ user.c:21:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&b); ^ user.c: In function ‘cmmdc’: user.c:5:9: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] int c,d; ^