Compilare: user.c: In function ‘main’: user.c:17:39: warning: operation on ‘i’ may be undefined [-Wsequence-point] fprintf(fo,"%d %d\n",i+++1,i+2); ~^~ user.c:20:42: warning: operation on ‘i’ may be undefined [-Wsequence-point] fprintf(fo,"%d %d %d\n",i+++1,i+2,i+3); ~^~ user.c:20:42: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.c:9:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d",&n,&m); ^~~~~~~~~~~~~~~~~~~~~~~~ user.c:11:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&x); ^~~~~~~~~~~~~~~~~~