Compilare: main.cpp: In function 'int main()': main.cpp:32:35: warning: NULL used in arithmetic [-Wpointer-arith] for(i = 0; sum < w && s[i] != NULL; i++) ^~~~ main.cpp:37:16: warning: NULL used in arithmetic [-Wpointer-arith] if(s[i] == NULL) ^~~~ main.cpp:45:14: warning: statement has no effect [-Wunused-value] for(i; i >= 0 && sml < 3; i--) ^ main.cpp:18:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("texttrim.in","r",stdin); ^ main.cpp:19:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("texttrim.out","w",stdout); ^