Compilare: user.cpp: In function ‘int ident()’: user.cpp:11:56: warning: NULL used in arithmetic [-Wpointer-arith] while(c[i]!='+' && c[i]!='-' && c[i]!='=' && c[i]!=NULL){ ^ user.cpp: In function ‘void rezolva(char*)’: user.cpp:40:17: warning: NULL used in arithmetic [-Wpointer-arith] while(c[i]!=NULL){ ^ user.cpp:60:32: warning: format ‘%f’ expects argument of type ‘double’, but argument 2 has type ‘int’ [-Wformat=] else printf("%.4f\n", 0); ^ /tmp/ccGCWcFy.o: In function `main': user.cpp:(.text.startup+0x85): warning: the `gets' function is dangerous and should not be used.