Compilare: user.cpp:38:33: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] char crtLine[MAX_LENGTH] = {NULL}; ^ user.cpp: In function ‘void Read()’: user.cpp:147:29: warning: format ‘%c’ expects argument of type ‘char*’, but argument 3 has type ‘int*’ [-Wformat=] fscanf(fin, "%c", &c); ^ user.cpp:156:37: warning: format ‘%c’ expects argument of type ‘char*’, but argument 3 has type ‘int*’ [-Wformat=] fscanf(fin, "%c", &c); ^ user.cpp:143:12: warning: unused variable ‘pos’ [-Wunused-variable] fpos_t pos; ^ user.cpp:144:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d %d", &n, &a, &r, &k); ^ user.cpp:147:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c", &c); ^ user.cpp:156:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c", &c); ^ user.cpp:166:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", &crtLine[0]); ^