Also, this is about the time (if you are working with Unix) to make a good makefile. (The Microsoft compiler takes care of these things for you.) For your reference, my ``makefile'' at present appears as
OPTS = -g
LIBRARIES = -lm
OBJECTS = integ.o rk4p480.o rtbisp480.o zriddrp480.o nrutil.o
.c.o:
cc ${OPTS} -c $<
a.out: main.o $(OBJECTS)
cc ${OPTS} main.o $(OBJECTS) $(LIBRARIES)