Compilare: user.c: In function ‘main’: user.c:8:37: warning: unused variable ‘c’ [-Wunused-variable] int max,i,lat,con,t,n,lin,col,j,c; ^ user.c:11:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d\n%d %d %d\n" ,&t,&lin,&col,&n); ^ user.c:15:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d %d\n" ,&lin1[i],&col1[i],&lin2[i],&col2[i]); ^