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+//
+// Often C functions are used where no equivalent Zig function exists
+// yet. Since the integration of a C function is very simple as already
+// seen in the last exercise, it naturally offers itself to use the
+// very large variety of C functions for the own programs.
+// In addition immediately an example:
+//
+// Let's say we have a given angle of 765.2 degrees. If we want to
+// normalize that, it means that we have to subtract X * 360 degrees
+// to get the correct angle. How could we do that? A good method is
+// to use the modulo function. But if we write "765.2 % 360", it won't
+// work, because the standard modulo function works only with integer
+// values. In the C library "math" there is a function called "fmod".
+// The "f" stands for floating and means that we can solve modulo for
+// real numbers. With this function it should be possible to normalize
+// our angel. Let's go.
+
+const std = @import("std");
+
+const c = @cImport({
+    // What do wee need here?
+    ???
+});
+
+pub fn main() !void {
+    const angel = 765.2;
+    const circle = 360;
+
+    // Here we call the C function 'fmod' to get our normalized angel.
+    const result = c.fmod(angel, circle);
+
+    std.debug.print("The normalized angle of {d: >3.1} degrees is {d: >3.1} degrees.\n", .{ angel, result });
+}