Exam
COMPUTER HISTORY- Chapter 1
So many firsts:
The word "computer" was first used
The word "computer" was first recorded as being used in 1613 and was originally was used to describe a human
who performed calculations or computations. The definition of a computer remained the same until the end of
the 19th century when people began to realize machines never get tired and can perform calculations much
faster and more accurately than any team of human computers ever could…
BOOLEAN OPERANDS- Chapter 3
Summary of Operators
Arithmetic operators: +, -, /, *, ^, %
String concatenation (attach the second string to the
end of the first string): +
Increment/decrement (increase/decrease): ++, - This lets you easily add 1 to, or subtract 1 from, a
variable.
Example:
 numStudents += 1;
And
 numStudents++;
Are both the equivalent of
 numStudents = numStudents + 1;
Relational operators (compare values):
Boolean Operands:
AND- A Boolean expression using && is only true
if both operands are true
NOT- A Boolean ! simply inverts the Boolean
value
OR- A Boolean expression
using || is only false if
both operands are false
No
space
here
Logical operators (truth table for comparing
expressions):
Operator Precedence
Just like in maths, operators calculate a certain operator
first. For example:
 3+2*5=13
o You would do the * first. So 2*5=10. Then
10+3=13
 (3+2)*5=25
o You would do the () first. So 3+2=5. Then 5*5=25
Mathematical Operators
^ means exponentiation
o 2 ^ 3 evaluates to 8
/ means integer division (when dealing with integer
numbers)
o 14 / 3 evaluates to 4
% means remainder
o 14 % 3 evaluates to 2
So 14/3= 4 (4*3=12) remainder 2