echitabil.cpp: In function 'int main()': echitabil.cpp:15: warning: comparison between signed and unsigned integer expressions echitabil.cpp:20: warning: name lookup of 'i' changed echitabil.cpp:5: warning: matches this 'i' under ISO standard rules echitabil.cpp:15: warning: matches this 'i' under old rules echitabil.cpp:22: warning: comparison between signed and unsigned integer expressions echitabil.cpp:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result echitabil.cpp:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result echitabil.cpp:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result echitabil.cpp:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result