Compilare: user.cpp: In function ‘int main()’: user.cpp:15:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=strlen(n+1)/2;i++) ^ user.cpp:18:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=strlen(c+1)/2;i++) ^ user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=strlen(n+1);i++) ^ user.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=strlen(c+1);i++) ^