robot1.cpp: In function 'void back(int, int, int, int)': robot1.cpp:12: warning: unused variable 'i' robot1.cpp: In function 'int main()': robot1.cpp:34: warning: suggest parentheses around '&&' within '||' robot1.cpp:34: warning: suggest parentheses around '&&' within '||' robot1.cpp:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result robot1.cpp:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result robot1.cpp:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result