▶ NUMBERS
Number is a positive or negative whole number, as in { ..., -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, ... }.
Consider this program:
main »
age 22
print age
22
First we assign the numeric value: 22, to the
age variable. The
print function is a system function that handles printing of variables.
Numbers can be added by the '+' operator:
main »
one_plus_two 1 + 2
print one_plus_two
3
Assigning sum of variables to a new variable:
main »
num1 1
num2 2
sum num1 + num2
In the line: '
Other options of adding numeric variables and numbers:
sum num1 + num2', the sum of num1 and
num2 variables is calculated, and then is assigned to sum variable.Other options of adding numeric variables and numbers:
main »
num1 1
num2 2
sum1 num1 + 2
sum2 num1 + num2
print sum1
print sum2
print 1 + 2
print num1 + num2
3
3
3
3
3
3
3
Consider this shopping list program:
main »
t_shirts_num 2
t_shirt_price 32
t_shirts_price t_shirts_num * t_shirt_price
print 'The price of ' + t_shirts_num + ' T-shirts is: ' + t_shirts_price
blue_jeans_num 2
black_jeans_num 1
total_jeans_num blue_jeans_num + black_jeans_num
jeans_price 42
total_jeans_price total_jeans_num * jeans_price
print 'The price of ' + total_jeans_num + ' jeans is: ' + total_jeans_price
sum_total t_shirts_price + total_jeans_price
print '-----------------------------------'
print 'SUM TOTAL: ' + sum_total
The price of 2 T-shirts is: 64
The price of 3 jeans is: 126
-----------------------------------
SUM TOTAL: 190
The price of 3 jeans is: 126
-----------------------------------
SUM TOTAL: 190
Attention: Tyl is not a mathematical calculator!
In this code:
print 1 + 2 * 3
print 1 * 2 + 3
print 3 * 2 + 1
7
5
9
5
9
All of the lines are calculated in Tyl Statement Order:
So, first line went fine:
A OP1 ( B OP2 C )regardless of mathematical operations order!
So, first line went fine:
1 + 2 * 3 = 7. Second line escaped error, because:
1 * (2 + 3) = 1 * 2 + 3 (could be nice to write a program that will find more
of these numbers). The third line is not following mathematical order! Instead it is calculated
according to Tyl Statement Order: 3 * (2 + 1) = 9