Page 167 - DCAP210_INTRODUCTION__TO_MICROPROCESSORS

Unit 11: Counters and Time Delays

11.6 Programs Using If Loops Counters Accumulators Notes

Program to print possible sum combinations of a number
class NumberCombinations
{
void makeCombinations(int n)
{
int sum,x,y,z,p;
for(x=1 ; x<=9 ; x++)
{
for(y=x ; y<=9 ; y++)
{
sum =x+y;
if(sum==n)
System.out.println(x + “ + “ + y);
for(z=1 ; z<=9 ; z++)
{
sum=sum+z;
if(sum<n)
continue;
else
break;
}//for ends
if(sum==n)
{
System.out.print(x + “ + “ + y);
for(p=1 ; p<=z ; p++)
System.out.print(“ + “ + p);
System.out.println();
}//if ends
}//for ends
}//for ends
}//method ends
}//class ends

11.7 Hexadecimal Counter

Hexadecimal means 16 and we are using what is called ‘Base 16’ when we count in Hex
(Hexadecimal). Base 16 means that each column can hold up to 16 numbers before it has to be
zeroed out, and 1 added to the next column to the left. We can put any one of 16 numbers in
Column 1 (zero and 1-9 and A-F).
When we are counting and we reach F (the equivalent of 15 in decimal) in Column 1, Column 1 is
full and we zero it out. We then add 1 to Column 2 and a put a 0 in Column 1.
If we keep on counting in this manner, adding 1 to col 2 every time col 1 reaches F, we fill up cols
1 and 2 to a value of FF.

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