Compilare: user.cpp: In function ‘int main()’: user.cpp:14:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(num);i++) ~^~~~~~~~~~~~ user.cpp:36:8: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] else if(yn-y<0) ^~ user.cpp:38:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ x=xn; ^