ferma1.cpp: In function 'int main()': ferma1.cpp:22: warning: unused variable 'k' ferma1.cpp:22: warning: unused variable 'l' ferma1.cpp:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ferma1.cpp:21: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ferma1.cpp:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ferma1.cpp:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ferma1.cpp:22: warning: 'x' may be used uninitialized in this function ferma1.cpp:22: warning: 'y' may be used uninitialized in this function ferma1.cpp:23: warning: 'cul' may be used uninitialized in this function