Compilare: user.cpp: In function ‘int main()’: user.cpp:13:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) ~^~~~~~~~~~ user.cpp:21:1: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation] else ^~~~ user.cpp:27:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘else’ return 0; ^~~~~~