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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]
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
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