Compilare: user.cpp: In function ‘int main()’: user.cpp:17:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<=strlen(sir)) ~^~~~~~~~~~~~~ user.cpp:55:9: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation] else ^~~~ user.cpp:71:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘else’ i++; ^