Compilare: user.c: In function ‘main’: user.c:22:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(nr==n+1) ^~ user.c:24:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ rez=i; ^~~ user.c:14:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%lu",&n); ^~~~~~~~~~~~~~~~~~~ user.c:33:19: warning: ‘rez’ may be used uninitialized in this function [-Wmaybe-uninitialized] long unsigned res=rez*rez; ^~~