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Questions and Answers
What is the purpose of the upcoming quiz on Wednesday?
What should students bring to the Tie Dye event?
How do you ensure that rand() generates different sequences of random numbers each time?
What is required to generate a random number in a program?
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Which library must be included to use the rand() function?
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What happens if you run a program using rand() without setting a seed?
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What is the range of random numbers generated by rand() without any modifications?
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What is the correct way to generate a random number between 1 and 10 using rand()?
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Study Notes
Quiz Information
- Scheduled for Wednesday; designed to be short and low-stakes.
- Conducted on paper and covers material from the past two weeks, primarily for review purposes.
- Aims to enhance skills in writing and reading code, akin to a whiteboard interview scenario.
- Questions will reflect the instructor's typical style to familiarize students.
- Serves as a bi-weekly review mechanism to alleviate last-minute cramming for exams.
Tie Dye Event Details
- Event takes place on Tuesday night from 6 PM to 8 PM on the 2nd floor of Smith Hall.
- Participants are encouraged to bring items for tie-dying, such as university apparel like t-shirts or sweatshirts.
- Open invitation to drop by and socialize, even if not participating in dyeing.
Upcoming Lab Assignment
- Next lab due on Friday, September 20.
- Assignment focuses on the use of matrices, classes, and objects.
- Additional information available through a provided link regarding past topics.
Random Numbers in C++
- To generate random numbers in C++, use
#include <cstdlib>. - The basic command
int x = rand();produces a random number within a predefined range. - Without a specific seed, the random number sequence remains unchanged across executions.
Seeding Random Number Generation
- To avoid repetition of the same random numbers, a seed must be established.
- The current time is typically employed as a seed for randomness:
srand(time(NULL));. - Seeding should only occur once per program, before the first call to
rand(). - After seeding, the command
int x = rand();will yield varied outputs each execution.
Generating Random Numbers within a Range
- To generate a random number between 1 and 10, a specific method is required, which involves mathematical operations (not detailed in the text).
Data Types and Example Variables
- Example double variable:
double d = 200.374;. - Example integer variables:
int i = 100;,int j = -100;. - Demonstrates declaration of different variable types in C++.
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