Compilare: user.cpp: In function ‘int main()’: user.cpp:84:20: warning: NULL used in arithmetic [-Wpointer-arith] for (i=0;s[i]!=NULL;i++){ ^ user.cpp:80:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&c); ^ user.cpp:83:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets (s,500001,fin); ^