Compilare: main.c: In function 'main': main.c:31:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&a[i]); ^~~~~~~~~~~~~~~~~~~~~~ main.c:55:12: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] if(y&(1<<i)) { ^ main.c:49:12: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] if(x&(1<<i)) { ^