Merge pull request #16 from h1110050/add-pointer-functions

An example of how to use pointers in functions in C

pointer_functions.c

@@ -0,0 +1,30 @@
+/*  This program swaps values by passing variables as pointers into a function in C.
+ *  Author: h1110050
+ *  Profile: http://github.com/h1110050
+ */
+
+#include <stdio.h>
+
+void swap(int *, int *);
+
+int main(void) {
+    int a = 1, b = 3;
+
+    printf("a is %d, b is %d\n", a, b);
+
+    // Pass in the address if you want the change to persist in main function.
+    swap(&a, &b);
+
+    printf("a is %d, b is %d\n", a, b);
+
+    return 0;
+}
+
+void swap(int *a, int *b) {
+    int temp;
+
+    // Swap the pointers.
+    temp = *a;
+    *a = *b;
+    *b = temp;
+}