tgraf.cpp: In function 'void citire()': tgraf.cpp:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result tgraf.cpp:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result tgraf.cpp: In function 'int main()': tgraf.cpp:93: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tgraf.cpp:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tgraf.cpp:96: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result tgraf.cpp: In function 'int calcul(int)': tgraf.cpp:89: warning: control reaches end of non-void function