CMSC 160 -- Lab 13

Lab 13

Download your lab file

  1. Use wget to download the file at http://cs.longwood.edu/courses/cmsc160/f17/files/lab13.tgz
  2. Uncompress the lab13.tgz file by using tar -xvzf lab13.tgz
  3. Use ls to see that there is a new directory called lab13
  4. Use cd lab13 to change directory to the lab13 directory

The Problems

Here are 15 review problems for the exam. You will need to write eight of the following functions:
  1. reverse 
    input:  a string str
output: the string in reversed order	
example: "abcde" ==> "edcba"
  2. mix 
    input:  two strings	
output: a string
example: "abcde" "123" ==> "a1b2c3de"
  3. blend 
    input:  two strings	
output:  every other character with the second string reversed	
example: "abcde" "123" ==> "a3b2c1de"
  4. divisors 
    input:  an integer	
output:  the divisors of the integer	
example: 24 ==> [1,2,3,4,6,8,12,24]
  5. factors 
    input:  an integer	
output:  the prime factors of the integer	
example: 24 ==> [2,3]
  6. removeDups 
    input:  a vector of integers	
output: a vector containing no duplicates	
example: [1,3,3,2,1,5,0] ==> [1,3,2,5,0]
  7. loonger 
    input:  a string	
output: a string with every 'o' or 'O' duplicated	
example: "longwood" ==> "loongwooood"
  8. noVowels 
    input:  a lowercase string	
output: a string with every vowel removed ("aeiou")	
example: "longwood" ==> "lngwd"
  9. sometimesY 
    input:  a lowercase string	
output: a string with every vowel removed ("aeiou" and randomly `y')	
example: "longwood" ==> "lngwd" (remember rand() returns a random integer)
  10. gcd 
    input:  an int a and an int b 	
output: the greatest common divisor between two numbers	
example: 16 64 ==> 16
  11. Circle 
    todo:  write a struct Circle	
fields: a radius and a center (both x and y)
  12. circleArea 
    input:  a Circle 	
output: the area of the circle
  13. countZero 
    input:  a two dimensional vector of integers 	
output: the number of entries in the vector of vectors which contain 0
  14. fileReverse 
    input: two strings representing an input file name and an output file name
output: none 
todo: open and read the file line by line and 
write to a file the lines of the text file in reverse... last line first with the characters in each line reversed (last char first...)
  15. shifty 
    input:  a string and an int r	
output: each character in the string should be shifted r positions... characters at the end wrap	
example: "longwood" 3 ==> "oodlongw"

Handin

Your completed lab is due on Nov. 30th at 6pm. It should be handed in by using the make handin command.