fibo1.cpp: In function 'int main()': fibo1.cpp:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result fibo1.cpp:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result fibo1.cpp:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result fibo1.cpp: In function 'void fibonacci(int, int, int)': fibo1.cpp:7: warning: 'f3' may be used uninitialized in this function