fib.cpp: In function `int main()': fib.cpp:13: warning: unknown conversion type character 0xa in format fib.cpp:8: warning: `int cifra' might be used uninitialized in this function fib.cpp:8: warning: `int c1' might be used uninitialized in this function fib.cpp:8: warning: `int x' might be used uninitialized in this function fib.cpp:9: warning: `char u' might be used uninitialized in this function fib.cpp:92:1: warning: no newline at end of file