Comp Sci Ch 3 Ch 4 Flashcards
What is a branch and when is it executed?
and if statement executed under a certain condition
What is an if-else branch and when is it executed?
2 branches
if branch executed if true, then else is executed if false
What is an if-else-if-else branch?
each branch is checked until one is found to be true
In a conditional expression you use…
==, and relational operators
What is a bool value?
True or False
How are characters compared?
with their ASCII
How are strings compared?
same number of characters and if their characters are identical
What are the logical operators
&&, ||, !
How to compare floating point numbers?
fabs (x-y) < .0001
What is epsilon?
the difference threshold that floating point numbers are equal
How do you get a random number?
rand()
What needs to be enabled to use rand()
(#) include < cstdlib >
How do you get a specific range of random numbers?
rand() % (largest-smallest +1) + smallest
How do you determine number values in range of randomization coputation
large-small +1
What is pseudo?
not actually but having the appearance of
How is the sequence determined?
seed
How do you get a different/make a different seed?
srand(#), CALLED ONCE ONLY
How do you get a truly random sequence each time?
srand(time(0));
What needs to be enabled to use time (0)?
(#) include < ctime>
What is a do-while loop?
running the body at least once then checking if run again
- do then check
do {
}while (expression);
What is a loop?
repeatedly executes body while expression is true
What is an iteration?
each time a loop’s statements execute
What is a while loop?
checks to run
check, and run if expression is true
while (expression) {
}
What is a sentinel loop?
loop that keeps going until a value stops it
What is a sentinel value?
a special value indicating the end of a list
When trying to find a range, do you always need the plus one?
add the plus one when the large number is included
What is the order of evaluation?
P ! M R E L
parentheses
not
math
relational
equality
logical
