Compilare: user.cpp: In function ‘int compara(int)’: user.cpp:72:36: warning: NULL used in arithmetic [-Wpointer-arith] if (prod[mn+1].p[0] == NULL) ^ user.cpp: In function ‘int main()’: user.cpp:88:23: warning: unused variable ‘i’ [-Wunused-variable] int len=strlen(r),i,j,nr,x,mn,ok,intra,cac,odata=0; ^ user.cpp:88:30: warning: unused variable ‘x’ [-Wunused-variable] int len=strlen(r),i,j,nr,x,mn,ok,intra,cac,odata=0; ^ user.cpp:88:32: warning: unused variable ‘mn’ [-Wunused-variable] int len=strlen(r),i,j,nr,x,mn,ok,intra,cac,odata=0; ^ user.cpp:88:35: warning: unused variable ‘ok’ [-Wunused-variable] int len=strlen(r),i,j,nr,x,mn,ok,intra,cac,odata=0; ^ user.cpp:88:38: warning: unused variable ‘intra’ [-Wunused-variable] int len=strlen(r),i,j,nr,x,mn,ok,intra,cac,odata=0; ^ user.cpp: In function ‘int compara(int)’: user.cpp:82:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:119:29: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] else compara(nr); ^