SEEM3460 Tutorial

1. SEEM3460 Tutorial Multi-module programming in C

2. Create a working directory • Copy the material: • mkdir ~/c_multi • cd ~seem3460/distribute/c_multi-module • cp -r ask ~/c_multi • Change directory: • cd ~/c_multi/ask

3. Framework 1

4. Target Structure

5. Step 1a: open new files palindrome.c palindrome.h ask_palindrome.c #include <stdio.h> #include <string.h> int palindrome(...) { ... } int reverse(...) { ... } int main(...) { ... }

6. Step 1b: link files palindrome.c palindrome.h ask_palindrome.c #include “palindrome.h” #include <stdio.h> #include <string.h> #include “palindrome.h” int palindrome(...) { ... } int reverse(...) { ... } int main(...) { ... }

7. Step 1c: move code palindrome.c palindrome.h ask_palindrome.c #include <string.h> #include “palindrome.h” int palindrome(...) { ... } int reverse(...) { ... } int palindrome(...); int reverse(...); //the second line is temporary #include <stdio.h> #include <string.h> #include “palindrome.h” int palindrome(...) { ... } int reverse(...) { ... } int main(...) { ... }

8. Step 2a: open new files reverse.c reverse.h palindrome.c #include <string.h> #include “palindrome.h” int palindrome(...) { ... } int reverse(...) { ... }

9. Step 2b: link files reverse.c reverse.h palindrome.c #include “reverse.h” #include <string.h> #include “palindrome.h” #include “reverse.h” int palindrome(...) { ... } int reverse(...) { ... }

10. Step 2c: move code reverse.c reverse.h palindrome.c palindrome.h #include <string.h> #include “reverse.h” int reverse(...) { ... } int reverse(...); #include <string.h> #include “palindrome.h” #include “reverse.h” int palindrome(...) { ... } int reverse(...) { ... } int palindrome(...); int reverse(...); //the second line is temporary

11. Step 3: revise ask_reverse.c #include <stdio.h> #include <string.h> #include “reverse.h” int reverse(...) { ... } int main(...) { ... }

12. Step 4: compile • Create .o files: • gcc -c reverse.c • gcc -c palindrome.c • gcc -c ask_palindrome.c • gcc -c ask_reverse.c • Link .o files as executables: • gcc -o ask_palindromeask_palindrome.opalindrome.oreverse.o • gcc -o ask_reverseask_reverse.oreverse.o

13. Framework 2 (for your interest)