joc9.cpp: In function 'int add(int, int, int, int)': joc9.cpp:7: warning: unused variable 'e' joc9.cpp: In function 'int main()': joc9.cpp:87: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result joc9.cpp:88: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result joc9.cpp:90: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result joc9.cpp: In function 'int add(int, int, int, int)': joc9.cpp:84: warning: control reaches end of non-void function