Compilare: user.cpp:12:31: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] char sir[MAX_LENGTH] = { NULL }; ^ user.cpp:23:36: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] char matrix[MAX_N][MAX_N] = { NULL }; ^ user.cpp: In function ‘int NumberCounter(int&)’: user.cpp:72:22: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while(sir[index] >= '0' & sir[index] <= '9') ^ user.cpp: In function ‘void Read()’: user.cpp:38:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", &sir[0]); ^ user.cpp: In function ‘int Counter(int&)’: user.cpp:108:1: warning: control reaches end of non-void function [-Wreturn-type] } ^