So i have 3 files. main.c, test.c and test.h
main.c contains:
test.cCode:#include "test.h" #include <stdio.h> and code
test.hCode:#include "test.h" and code
How would i build this???Code:typedef struct { int test1; int test2; int test3; } test;
i tried gcc -o main.c test.c test.h
but i get a compiler error
Last edited by SuperMiguel; 03-28-2012 at 02:30 PM.
gcc -o prog main.c test.c
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
i did that and i get:Originally Posted by Salem
Code:test.c: In function ‘input_test’: test.c:21: warning: incompatible implicit declaration of built-in function ‘scanf’ test.c:21: error: ‘test1’ undeclared (first use in this function) test.c:21: error: (Each undeclared identifier is reported only once test.c:21: error: for each function it appears in.) test.c:21: error: ‘test2’undeclared (first use in this function) test.c:21: error: ‘test3’ undeclared (first use in this function) test.c:22: warning: ‘return’ with a value, in function returning voidon main.c there is #include <stdio.h>, so why would i get this error??Code:test.c:21: warning: incompatible implicit declaration of built-in function ‘scanf’
Because those errors are in test.c. If you plan on using functions from stdio.h in test.c, then you must #include it in test.c.
As a side note, it would be good to get in the habit of turning the warnings all the way up, and make sure you fix them all. Just add a -Wall to the commandline:
gcc -Wall -o prog main.c test.c
how about
they are defined in test.hCode:test.c:21: error: ‘test1’ undeclared (first use in thisfunction)test.c:21: error: (Each undeclared identifier is reported only oncetest.c:21: error: foreach function it appears in.) test.c:21: error: ‘test2’undeclared (first use in thisfunction) test.c:21: error: ‘test3’ undeclared (first use in thisfunction)
Code:typedef struct { int test1; int test2; int test3; } test;
Well, I can't say for sure, since you didn't actually post any code for test.c. I'm guessing you're not using them as members of a struct. They do not work as variables on their own when declared inside a struct like you did.
weird that error just went away.. the code is
Code:void input_test(test *dp) { scanf("%d", &test.test1); return; }
That should not actually work. test is the name of a type, not a variable. You can't reference a member (e.g. test1) of the type itself. You must reference the test1 member of a variable. Something here doesn't add up. You're not showing the full code (the entire contents of every file) exactly as it is on your system, or you've changed something.
