function pointer

practice/lc_functionPointers.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void someFunction(int arg)
+{
+    printf("This is someFunction being called and arg is: %d\n", arg);
+    printf("Now, leaving the funciton!\n");
+}
+
+int compare(const void* left, const void* right)
+{
+    return (*(int*)right - *(int*)left);
+}
+
+int main()
+{
+    void (*pf)(int);
+    pf = &someFunction;
+    printf("We are about to call someFunction() using a pointer!\n");
+    (pf)(5);
+    printf("Wow that was cool!");
+
+    int (*cmp)(const void*, const void*);
+    cmp = &compare;
+
+    int iarray[] = {1,2,3,4,7,5,6,9,8};
+    qsort(iarray, sizeof(iarray) / sizeof(*iarray), sizeof(*iarray), cmp);
+
+    int c = 0;
+    while (c < sizeof(iarray) / sizeof(*iarray))
+    {
+        printf("%d\t", iarray[c]);
+        c++;
+    }
+
+    return 0;
+}