|
|
|
How Do You Create a Module?A module is a package of Pike code, typically a file. You can also write modules in C or C++, but how to do that is outside the scope of this tutorial. The module is a file of Pike code. Lets say that we want to create a module called trig, which has two members: a method cos2 that calculates the square of the cosine function, and the constant pi. We create a file, called trig.pmod, with the following contents: float cos2(float f) { return pow(cos(f), 2.0); } constant PI = 3.1415926535; Now that the module file exists, we can use it. If we use it from a program that is stored in the same directory as trig.pmod, we can use the .module-name notation, so the program will look like this: int main() { write("The square of cos(pi/4) is " + .trig.cos2(.trig.PI/4) + ".\n"); return 0; } Or, if we prefer to import the module: import .trig; // Import the module from this directory int main() { write("The square of cos(pi/4) is " + cos2(PI/4) + ".\n"); return 0; } |
|||||||||||