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Separating look and feel from business logic
Functions, Macros and programs in multiple files example from a Well House Consultants training course
More on Functions, Macros and programs in multiple files [link]
Source code: third.c Module: C204
#include <stdio.h>
/* Farming out logic to a function to keep the main code clean and to allow for (later on, perhaps) the code that contains the logic to be loaded from a separate file. By separating the input / output stuff from the calculations, we're starting to separate what the program actually does from how it looks and feels. That way, we can come along later and change our algorithms without having to alter the bit that interacts with the user (i.e. keep the thing working in a known and consistent way for our customers). And we can also change the look and feel if we feel those could do with improvement (or simply a fresh lick of paint!) without upsetiing the logic and calculations behind the page */ float getbmi(float w, float h) { float bmi; /*gcc -o third third.c */ bmi = w / (h * h); return bmi; } int main () { float height,weight; /* about the vars ... */ float bmi; printf("How high are you (metres): "); scanf("%f",&height); printf("How hefty are you (kilograms): "); scanf("%f",&weight); bmi = getbmi(weight,height); printf ("I am here\n"); printf ("My height is %.2f and I weigh %.1f\n", height, weight); printf ("And my BMI is %.2f\n",bmi); return 0; } Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in C * Learning to program in C and C++ * Programming in C * C and C++ Programming * Learning to program in C and C++ * C and C++ Programming Also available on on site courses for larger groups Books covering this topic
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other closely related examples on the "Functions, Macros and programs in multiple files" module index page.
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