Compilare: main.cpp: In function 'int main()': main.cpp:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < strlen(A); j++) ~~^~~~~~~~~~~ main.cpp:65:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < strlen(A); j++) ~~^~~~~~~~~~~