Compilare: user.cpp: In function ‘int main()’: user.cpp:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void read()’: user.cpp:72: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:76: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:77: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:78: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void write()’: user.cpp:187: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘int*’ user.cpp:187: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘int*’ user.cpp:187: warning: format ‘%d’ expects type ‘int’, but argument 4 has type ‘int*’ user.cpp:187: warning: format ‘%d’ expects type ‘int’, but argument 5 has type ‘int*’