2sah.cpp: In member function 'matrice& matrice::operator*(const matrice&)': 2sah.cpp:22: warning: reference to local variable 'b' returned 2sah.cpp: In function 'int main()': 2sah.cpp:62: warning: format '%d' expects type 'int', but argument 2 has type 'long long int' 2sah.cpp:77: warning: format '%d' expects type 'int', but argument 2 has type 'long long int' 2sah.cpp:59: warning: unused variable 'i' 2sah.cpp:59: warning: unused variable 'j' 2sah.cpp:57: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result 2sah.cpp:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result 2sah.cpp:60: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result