Compilare: main.cpp: In function 'int main()': main.cpp:14:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0,j=0;i<strlen(a)&&j<strlen(b);i++) ~^~~~~~~~~~ main.cpp:14:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0,j=0;i<strlen(a)&&j<strlen(b);i++) ~^~~~~~~~~~