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Prompt - read - calculate - decide - report
A first practical program example from a Well House Consultants training course
More on A first practical program [link]

This example is described in the following article(s):
   • C course inspires new teaching examples - [link]

Source code: cvopt.c Module: C202
/* This is an example of a simple program in C ... a few steps
beyond a "first practical program", but never the less a good
string point for newcomers who want to write a program that reads
in some data from the user, does some calculations, makes some
decisions, and produces results. */


#include <stdio.h>

/* Define "compile time constants" which will allow you to change
values that are hard coded into the program when you rebuild it */

#define N_TRAINS 15

int main () {

/* Define the names and type of variables that you'll use in
the program. You may choose to give them initial values; if you
don't, they will take WHATEVER HAPPENED TO BE LEFT IN THAT MEMORY
FROM THE PREVIOUS PROGRAM (so you'll want their first use in your
code to assign a value to them! */

  int peeps;
  int trains = N_TRAINS;
  float pps;

/* Read and write sequence - prompt the user for input(s) and then
pause while those inputs are made / received */


  printf ("How many people to take? ");
  scanf ("%d", &peeps);

/* Here's an example of some initial calculations. Note that I've
had to force (co-erce) one of the ints into a float before I did the
division to ensure that the division itself was a float */

  pps = (float) peeps / trains;
  printf ("Taking %d people in %d trains ...\n", peeps, trains);
  printf ("There were %.2f people per train\n", pps);

/* Here's a demonstration of the use of conditionals to take
different actions depending on the value(s) held in variable(s) */


  if (pps > 550)
    {
      printf ("We have an overcrowding issue\n");
      if (pps > 650)
        {
          printf ("DANGER LEVELS\n");
        }
    }
  else if (pps < 100)
    {
      printf ("Why Bother\n");
    }
  else
    {
      printf ("Gooooooooooood\n");
    }

/* At the end of your program, you'll often summarise what was
done and also pass back to the operating system an indication of
sucess (0) or failure (1, or a higher number) */


  printf ("We's done\n");
  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
Yes. We have over 700 books in our library. Books covering C and C++ are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "A first practical program" training module. You'll find a description of the topic and some other closely related examples on the "A first practical program" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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This web site is written and maintained by Well House Consultants.

Purpose of this website
This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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