Compilare: main.cpp: In function 'void create1(int)': main.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < strlen(f2) / 2; ++i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < strlen(f); ++i) ~~^~~~~~~~~~~