Swap in C using pointers

Author: rfsjim

concepts/swap.c

@@ -0,0 +1,31 @@
+/*
+ * Swap
+ * Swaps two integers using pointers
+ * Gives overview of how pointers work
+ * variables are not passed by value but by reference
+ * & is addressof operator
+ * *ptr - pointer ptr can store the address of an integer 
+ */
+
+#include <stdio.h>
+
+void swap(int* a, int* b);
+
+int main(void)
+{
+ int x = 5;
+ int y = 10;
+
+ printf("x is %i, y is %i\n", x, y);
+
+ swap(&x, &y);
+
+ printf("x is %i, y is %i\n", x, y);
+}
+
+void swap(int* a, int* b)
+{
+ int tmp = *a;
+ *a = *b;
+ *b = tmp;
+}