Compilare: main.cpp: In function 'int main()': main.cpp:20:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; (1<<i) <= p; ++ i) ~~~~~~~^~~~ main.cpp:22:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if ( ((1<<i) & p) > 0) ^~ main.cpp:25:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' a =(a * a) % m; ^