From 7faf53b701ee34eff0187ee4cc71e2bd7f23a098 Mon Sep 17 00:00:00 2001
From: Tomasz Matejuk <tmatejuk.pro@gmail.com>
Date: Tue, 6 Oct 2020 15:48:13 +0200
Subject: [PATCH] Example on how to divide c programm into multiple files

with compilation instruction, and simple Makefile.
---
 OneProgramInMultipleFiles/.gitignore  |  2 ++
 OneProgramInMultipleFiles/Makefile    | 17 +++++++++++++++++
 OneProgramInMultipleFiles/README.md   |  8 ++++++++
 OneProgramInMultipleFiles/function1.c |  7 +++++++
 OneProgramInMultipleFiles/function1.h |  7 +++++++
 OneProgramInMultipleFiles/function2.c |  7 +++++++
 OneProgramInMultipleFiles/function2.h |  7 +++++++
 OneProgramInMultipleFiles/main.c      | 18 ++++++++++++++++++
 8 files changed, 73 insertions(+)
 create mode 100644 OneProgramInMultipleFiles/.gitignore
 create mode 100644 OneProgramInMultipleFiles/Makefile
 create mode 100644 OneProgramInMultipleFiles/README.md
 create mode 100644 OneProgramInMultipleFiles/function1.c
 create mode 100644 OneProgramInMultipleFiles/function1.h
 create mode 100644 OneProgramInMultipleFiles/function2.c
 create mode 100644 OneProgramInMultipleFiles/function2.h
 create mode 100644 OneProgramInMultipleFiles/main.c

diff --git a/OneProgramInMultipleFiles/.gitignore b/OneProgramInMultipleFiles/.gitignore
new file mode 100644
index 0000000..3e0f233
--- /dev/null
+++ b/OneProgramInMultipleFiles/.gitignore
@@ -0,0 +1,2 @@
+a.out
+
diff --git a/OneProgramInMultipleFiles/Makefile b/OneProgramInMultipleFiles/Makefile
new file mode 100644
index 0000000..8ec0924
--- /dev/null
+++ b/OneProgramInMultipleFiles/Makefile
@@ -0,0 +1,17 @@
+#
+#simple makefile with only explicyt rules  
+#
+
+TARGET= a.out
+$(TARGET): main.o function1.o function2.o
+	gcc -o $(TARGET) main.o function1.o function2.o 
+
+main.o: main.c
+	gcc -c main.c
+
+function1.o: function1.c  function1.h 
+	gcc -c function1.c
+
+function2.o: function2.c  function2.h 
+	gcc -c function2.c
+
diff --git a/OneProgramInMultipleFiles/README.md b/OneProgramInMultipleFiles/README.md
new file mode 100644
index 0000000..33a2918
--- /dev/null
+++ b/OneProgramInMultipleFiles/README.md
@@ -0,0 +1,8 @@
+example how to create c program that uses more than one file
+
+compile with command :
+ gcc -Wall main.c function1.c function2.c
+
+or with command :
+ make
+
diff --git a/OneProgramInMultipleFiles/function1.c b/OneProgramInMultipleFiles/function1.c
new file mode 100644
index 0000000..ae53b0c
--- /dev/null
+++ b/OneProgramInMultipleFiles/function1.c
@@ -0,0 +1,7 @@
+#include "function1.h"
+
+int func1(int a, int b)
+{
+    return 2*(2*a+b);
+}
+
diff --git a/OneProgramInMultipleFiles/function1.h b/OneProgramInMultipleFiles/function1.h
new file mode 100644
index 0000000..51849d4
--- /dev/null
+++ b/OneProgramInMultipleFiles/function1.h
@@ -0,0 +1,7 @@
+#ifndef FUNCTION1_H
+#define FUNCTION1_H
+
+int func1(int a, int b);
+
+#endif
+
diff --git a/OneProgramInMultipleFiles/function2.c b/OneProgramInMultipleFiles/function2.c
new file mode 100644
index 0000000..70e98fc
--- /dev/null
+++ b/OneProgramInMultipleFiles/function2.c
@@ -0,0 +1,7 @@
+#include "function2.h"
+
+int func2(int a, int b)
+{
+    return a-2-1*3*b;
+}
+
diff --git a/OneProgramInMultipleFiles/function2.h b/OneProgramInMultipleFiles/function2.h
new file mode 100644
index 0000000..ecd7eaf
--- /dev/null
+++ b/OneProgramInMultipleFiles/function2.h
@@ -0,0 +1,7 @@
+#ifndef FUNCTION2_H
+#define FUNCTION2_H
+
+int func2(int a, int b);
+
+#endif
+
diff --git a/OneProgramInMultipleFiles/main.c b/OneProgramInMultipleFiles/main.c
new file mode 100644
index 0000000..f78b6fe
--- /dev/null
+++ b/OneProgramInMultipleFiles/main.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include "function1.h"
+#include "function2.h"
+
+int main(void)
+{
+    int a, b;
+    printf("Insert two numbers: ");
+    if(scanf("%d %d", &a, &b)!=2)
+    {
+        fputs("Invalid input", stderr);
+        return 1;
+    }
+    printf("func1 result: %d\n", func1(a, b));
+    printf("func2 result: %d\n", func2(a, b));
+    return 0;
+}
+