Compilare: main.c: In function 'main': main.c:30:25: warning: unused variable 'r' [-Wunused-variable] 30 | int n,d,i,j, a, b, x, r; | ^ main.c:30:19: warning: unused variable 'b' [-Wunused-variable] 30 | int n,d,i,j, a, b, x, r; | ^ main.c:30:16: warning: unused variable 'a' [-Wunused-variable] 30 | int n,d,i,j, a, b, x, r; | ^ main.c: In function 'calcBlackMagic': main.c:26:10: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized] 26 | return r; | ^