Making plans

=== under construction ==
partly in English partly in Dutch

Plans are basic ideas about your software problem and a software solution. You always start by making plans; mostly on paper or in a (pre) prototype or in a rapid developed prototype. There are a lot of problems and there are a lot of possibilities in solving these software problems. But mostly there are limited types of xxxx. There are 25, 30 until 40 basic solutions in programming your product. Here you see about 25 of them: a, b, c until z.

a. Initialising a variabele

A solution in programming is:

   var price = 10.0;

b. Changing a variabele

A solution in programming is:

   extra = 2.0 + 0.2

c. Changing two variabeles

A solution in programming is:

   waarde = 3;
   prijs  = 6;

   hulp   = waarde
   waarde = prijs;
   prijs  = hulp

d. Give a name to a constant

A solution in programming is:

    var mess = "Output: "; 

e. Give a logical value to a variable

   a = 'true';
   if ( a = true  ) {toeslag = 2.0 + 0.6};

   a = 'true';
   if ( a  ) {toeslag = 2.0 + 0.6};

   btw = 17.5;
   if ( btw>15 ) {toeslag = 2.0 + 0.6};

f. Display results (a presentation technique)

A solution in programming is:

   window.document.writeln("De waarde is: ")

   window.document.writeln("Output: ", getal, a)

g. Accept a value to a variable (an acceptation technique)

   xxxx

h. Control an input value

   if ( (invoer<0) || (invoer>150) ) { window.alert('Foute leeftijd') }

i. Give an error massage (a presentation technique)

A solution in programming is:

   if ( c == 0 ) { window.alert('Delen door 0') }
   a= b / c;

j. Stop if a value is wrong

A solution in programming is:

   if ( (invoer<0) || (invoer>150) ) { exit() }

k. Reading in a file (a communication technique)

• from a text file
• from a grafical file
• from a sound file
• from an animation file
• from a video file
• from a class file

A solution in programming is:

xxxx

Reading a file and presenting their digital content on a screen is a very important technique.

l. Writing to a file (an I/O technique or communication technique)

xxxx

m. Repeat a number of statements (loop)

A solution in programming is:

   for ( j=5; j>10; j++ ) y = y*j;

   for ( j = n-1; j > 1; j-- ) y = y*j;

n. xxx

A solution in programming is: xxxx

o. xxxx

A solution in programming is:

   i = 3
   while(i>4)
    {
     j = j + 1;  
    }

Voorbeeld:

   i = 3
   {
     j = j + 1;
   } while(i>4)

p. Conditions for stopping

A solution in programming is:

   for (i=0; i<10; i++)
    {
      j = j + 1;
      if (j== 13) { exit() }
    }

q. Recursion

A solution in programming is:

function  fac(n)
   { var y
     if ( (n==0) || (n==1) ) return 1
     else { y = (n*fac(n-1)); return y }
   }

r. Doing something by a condition (if then)

A solution in programming is:

   if (temp>100) { tekst='Koken'}

s. A two way condition (if then else)

A solution in programming is:

   if ( direction == 'bakboord' )
    {
     naar = 'Links';
    }
   else
    {
     naar = 'Rechts'; 
    } 

t. A more way condition (if then else if)

A solution in programming is:

   if (hoogte>200) {soort ='reus';}
   else { if (hoogte<100) {soort ="klein duimpje";}
          else {soort = 'normaal';} }

u. Choose a random number

A solution in programming is:

   getal = Gmin + (Gmax-Gmin) * Random();

v. Using a function

A solution in programming is:

function input()
   {
    return (window.prompt("Input", ' '))
   }

antwoord = input();

w. The same, but with parameter transfer

A solution in programming is:

function invoer(tekst)
{
  return (window.prompt("tekst", ' '))
}

antwoord = invoer('Geef uw leeftijd');

x. Using an external object

A solution in programming is:

  xxxx

y. Using an applet

A solution in programming is:

xxxx

z. xxxx

A solution in programming is:

xxxx

Enschede, nov. 2000; updated: jan 29, 2003