jocs.cpp: In function 'void nrfp(int, int&)': jocs.cpp:3: warning: 'r' may be used uninitialized in this function /usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o: In function `_start': (.text+0x18): undefined reference to `main' collect2: ld returned 1 exit status