Compilare: user.cpp: In function ‘int main()’: user.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(a);i++) ^ user.cpp:26:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<strlen(b);j++) ^ user.cpp:31:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1] && k<strlen(a) && k1<strlen(b)) ^ user.cpp:31:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[k]==b[k1] && k<strlen(a) && k1<strlen(b)) ^