Compilare: main.cpp: In function 'int main()': main.cpp:20:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(x);i++) ~^~~~~~~~~~ main.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(i=0;i<strlen(x);i++) ~^~~~~~~~~~ main.cpp:29:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(i=0;i<strlen(x);i++) ~^~~~~~~~~~ main.cpp:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(i=0;i<strlen(x);i++) ~^~~~~~~~~~