Compilare: user.cpp: In function ‘int main()’: user.cpp:17:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; (1<<i) <= p; ++ i) ~~~~~~~^~~~ user.cpp:19:9: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if ( ((1<<i) & p) > 0) ^~ user.cpp:22:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ n=(n * n) % m; ^