Compilare: user.c: In function ‘heap_build’: user.c:45:9: warning: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘int’ [-Wformat=] scanf("%d",val); ^ user.c:45:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",val); ^ user.c: In function ‘main’: user.c:62:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.c:67:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&a); ^ user.c:71:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&a); ^ user.c: In function ‘heap_build’: user.c:45:14: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized] scanf("%d",val); ^