Compilare: user.cpp: In function ‘int main()’: user.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) ^ user.cpp:9:29: warning: unused variable ‘nr’ [-Wunused-variable] int i,v[15]={0},n,max=0,nr=0,x,k=0; ^ user.cpp:10:16: warning: unused variable ‘c’ [-Wunused-variable] char s[15],c[15]; ^