Compilare: main.cpp: In function 'int main()': main.cpp:142:34: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] ora1[0]='0'; ora1[8]=NULL; ^~~~ main.cpp:149:34: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] ora2[0]='0'; ora2[8]=NULL; ^~~~ main.cpp:156:17: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] ora1[6]=NULL; ^~~~ main.cpp:162:17: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] ora2[6]=NULL; ^~~~ main.cpp:113:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d\n",&k); ^ main.cpp:116:27: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(sir,100,fin); ^