Compilare: main.c: In function 'main': main.c:13:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d%d", &a, &b ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:17:18: warning: iteration 44719 invokes undefined behavior [-Waggressive-loop-optimizations] if ( ciur[i] == 0 ) { ~~~~^~~ main.c:16:5: note: within this loop for ( i = 2; i <= RAD; i++ ) { ^~~ main.c:20:21: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] for ( j = j * j; j <= RAD; j += j ) { ~~^~~~~~~