iepuri.cpp: In function 'void readinput()': iepuri.cpp:17: warning: comparison between signed and unsigned integer expressions iepuri.cpp:23: error: name lookup of 'i' changed for ISO 'for' scoping iepuri.cpp:23: note: (if you use '-fpermissive' G++ will accept your code) iepuri.cpp:23: warning: comparison between signed and unsigned integer expressions iepuri.cpp:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result iepuri.cpp:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result iepuri.cpp:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result iepuri.cpp: In function 'void go(unsigned int)': iepuri.cpp:31: warning: comparison between signed and unsigned integer expressions iepuri.cpp:37: warning: comparison between signed and unsigned integer expressions iepuri.cpp: In function 'void writeoutput()': iepuri.cpp:53: warning: comparison between signed and unsigned integer expressions iepuri.cpp:59: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result