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Separate function file and include file [main part]
Introduction to C example from a Well House Consultants training course
More on Introduction to C [link]
Source code: fourthmain.c Module: C101
#include <stdio.h>
/* Function prototype - this will tell this C source code what it will find in the functions that it loads from somewhere else. Such definitions are very typically found in the header files such as the standard one loaded above (which contains hundreds of things!) */ #include "fourth.h" main() { printf ("How long a piece of string?\n"); float gap; float mn; float nstr; nstr = 1; gap = 6.5; printf ("Gap is %.2f\n",gap); while (nstr < 10.0) { /* Hide calculation is separate function which can be looked after by the expert who knows all about this stuff. At a later point, the function can go in a separate file and (1) be used in lots of programs and (2) carefully tested on its own! */ /* the name used here IS the same name that will be used to define the function. BUT variable names are not shared. That makes sense - you don't want to call in Old Billy's code and find you can't use "Boris" and "Ken" as variable names as he has already done so! */ mn = ohgawd(gap,nstr); /* P.S. Passing everything over a single interface also means you can be certain of what the function needs and not have any nasty surprises about things it gets from elsewhere! */ printf ("If you want %4.0f strings, ",nstr); printf ("you need %6.2f metres\n",mn); nstr = nstr + 1.0; } } /* Sample Run munchkin:c grahamellis$ ./fourth How long a piece of string? Gap is 6.50 If you want 1 strings, you need 12.02 metres If you want 2 strings, you need 19.84 metres If you want 3 strings, you need 27.66 metres If you want 4 strings, you need 35.48 metres If you want 5 strings, you need 43.30 metres If you want 6 strings, you need 51.12 metres If you want 7 strings, you need 58.94 metres If you want 8 strings, you need 66.76 metres If you want 9 strings, you need 74.58 metres munchkin:c grahamellis$ */ 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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