Using C function in another function -

Using C function in another function -

i know has been answered, still can't work.

first.c

#include <stdio.h> #include "second.h" int main(void){ printf("%d\n", addone(5)); homecoming 0; }

second.c

int addone(int a){ homecoming ++a; }

second.h

int addone(int a);

when run gcc -o executable first.c -wall shows me undefined reference addone

#include <stdio.h> #include "second.h"

include headers in second.c file , write makefile , compile make.

makefile:

cflags = -g -o -wall obj = first.o second.o # explicit rule required link. # compilation handled automatically. first: $(obj) $(cc) $(cflags) -o first $(obj) # declare both object files depend on header file. first.o second.o: second.h # conventionally 'make clean' removes 'make' creates. # not strictly required. .phony: clean clean: -rm -f first $(obj)

you can't re-create , paste above; must alter both indented lines (the ones shell commands on them) indentation single hard tab character. if don't cryptic error message:

makefile:5: *** missing separator. stop.

first.c:

#include <stdio.h> #include "second.h" int main(void){ printf("%d\n", addone(5)); homecoming 0; }

second.c

#include <stdio.h> #include "second.h" int addone(int a){ homecoming ++a; }

second.h

#include <stdio.h> int addone(int a);

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