Expressions 🔢#
Expressions are one ore more operators grouped together.
Ex.
5 + 20 / 5
3 * 4 - 1
When C hits an expression, it will attempt to “solve”, or evaluate the expression to simplify it down to just one value. This means you can use expressions whereevere you can use a single value!
Ex.
int some_integer = 350 + 2 / 29;
int other_integer = some_integer;
printf("%d is my number!", some_integer);
printf("%d is an even number!", some_integer * 2);
Expressions can also use parenthesis to tell C which operators should be evaluated first.
Ex.
(5 + 10) * 2
4 / ((2 - 20) * 10)
Order of Operations#
C’s math operators follow the order of operations from math. This means the order operators are evaluated is
() Expressions in Parentehsis
*, /, % Mulitplication, Division, and Modulo
+, -, Addition and Subtraction
EX.
5 - 3 * 3 % 2 = 5 - 9 % 2 = 5 - 1 = 4
(5 - 3) * 3 % 2 = 2 * 3 % 2 = 6 % 2 = 0
Tasks 🎯#
What does the expression 5 - 2 * 3 + 1 evaluate to?
Solution ✅
5 - 2 * 3 + 1 = 5 - 6 + 1 = -1 + 1 = 0
What does the modulo operator do?
Solution ✅
The modulo operator gets the remainder from dividng the first number by the second number
What does the experssion 3 / 2 + 2 evaluate to?
Solution ✅
3 / 2 + 2 = 1 + 2 = 3due to operatorsinteger_division.
What does the experssion (5 + 2) % 3 / 2
Solution ✅
(5 + 2) % 3 / 2 = 7 % 3 / 2 = 1 / 2 = 0