triunghi.cpp: In function 'int main()': triunghi.cpp:77: warning: comparison between signed and unsigned integer expressions triunghi.cpp:43: warning: unused variable 'sm' triunghi.cpp:43: warning: unused variable 'sm1' triunghi.cpp:43: warning: unused variable 'sm2' triunghi.cpp:43: warning: unused variable 'sm3' triunghi.cpp:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result triunghi.cpp:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result triunghi.cpp:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result triunghi.cpp:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result triunghi.cpp:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result triunghi.cpp:48: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result triunghi.cpp:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result triunghi.cpp:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result triunghi.cpp:43: warning: 'ret' may be used uninitialized in this function