el.cpp: In function 'int main()': el.cpp:5: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result el.cpp:6: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result el.cpp:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result el.cpp:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result el.cpp:7: warning: 'x' may be used uninitialized in this function el.cpp:7: warning: 'y' may be used uninitialized in this function el.cpp:7: warning: 'o' may be used uninitialized in this function el.cpp:7: warning: 'v' may be used uninitialized in this function