sume1.cpp: In function 'int main()': sume1.cpp:22: warning: comparison between signed and unsigned integer expressions sume1.cpp:36: warning: comparison between signed and unsigned integer expressions sume1.cpp:40: warning: comparison between signed and unsigned integer expressions sume1.cpp:41: warning: comparison between signed and unsigned integer expressions sume1.cpp:45: warning: comparison between signed and unsigned integer expressions sume1.cpp:48: warning: comparison between signed and unsigned integer expressions sume1.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sume1.cpp:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result sume1.cpp:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result