CSCI 40 SI Session

Math Functions

100

What do you include if you have to use math functions in a program?

#include<cmath>

200

Give an example of pow() function?

pow(2,3) = 2^3

300

What is the output of fabs(99.108)?

99.108

400

What is the output of ceil(7.2)?

8.0

500

What is the output of floor(-2.4)?

-3.0

Strings& Characters

100

True or false – Strings are written in single quotes(‘xyz’).

False

200

What are the two ways of inputting a string?

cin way and the getline way

300

What is the syntax of declaring a character variable?

char variableName;

400

Name all the escape sequences.

/n,/t,/',/",//

500

What is the purpose of escape sequences?

To have the symbols (that already have meaning) as characters.

Binary

100

What is the purpose of binary?

The computer only understands 0s and 1s so every character is converted into binary for the computer to read.

200

True or False – Binary numbers consist of 1 and 2.

False

300

Is the binary of 7 = 111?

Yes

400

What is the decimal value for 1101?

13

500

What is the binary value of 16?

10000

Random Numbers

100

The ____ function, in the C standard library, returns a random integer each time the function is called, in the range 0 to RAND_MAX.

rand()

200

How can you produce random numbers from 0 to 10? (including 10)

rand()%11

300

Explain how we can produce random numbers between a range? (Is there a formula for it)

From x to y

[rand() % (x - y)] + x

400

The function ____ returns the number of seconds since Jan 1, 1970.

time()

500

Write a segment of code to find random numbers between 9 to 99.

[rand() % 90] + 9