Compilare: main.c: In function 'main': main.c:6:18: warning: left-hand operand of comma expression has no effect [-Wunused-value] out=("cmmdc.out","w"); ^ main.c:6:5: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types] out=("cmmdc.out","w"); ^ main.c:13:15: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] b=b-a; ~^~~~ main.c:13:15: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]