lightbot.cpp: In function 'int main()': lightbot.cpp:11: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result lightbot.cpp:15: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result lightbot.cpp:20: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result lightbot.cpp:62: warning: 'vmax' may be used uninitialized in this function