Compilare: user.cpp: In function ‘int main()’: user.cpp:33:36: warning: NULL used in arithmetic [-Wpointer-arith] }while (p[0]!=NULL); ^ user.cpp:51:36: warning: NULL used in arithmetic [-Wpointer-arith] }while (p[0]!=NULL); ^ user.cpp:9:6: warning: unused variable ‘c’ [-Wunused-variable] char c,s[300],s1[300],s2[300],*p,stot[300],*p1; ^ user.cpp:9:23: warning: unused variable ‘s2’ [-Wunused-variable] char c,s[300],s1[300],s2[300],*p,stot[300],*p1; ^