Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:14:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(s); i++) ^ user.cpp:19:18: error: incompatible types in assignment of ‘char’ to ‘char [256]’ st[0]='\0'; ^ user.cpp:29:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int b=0; b<strlen(st[j]); b++) ^ user.cpp:49:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int b=0; b<strlen(file[k]); b++) ^