Compilare: user.c: In function ‘main’: user.c:14:37: warning: unused variable ‘u’ [-Wunused-variable] int m,n,i,j,max = -999999,c1,c2,u,r = 0,a,sc; ^ user.c:15:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&m,&n); ^ user.c:20:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&a); ^