$course$/Simple demo questions C function: print string lengths Write a C function with signature void printStringLengths(int numStrings, char **strings) that takes an array of strings strings of length numStrings >= 0 and prints the length of each string, one length per line.

]]> 1.0000000 0.0000000 0 c_function 0 1 0, 10, 20, ... 0 0 12 90 1 1 2 3 4 SHOW 11 SHOW printStringLengths(0, NULL); SHOW 0 0 SHOW 1 1 HIDE C function: sqr Write a C function with signature int sqr(int n) that returns the square of its parameter n.

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]]> 1.0000000 0.0000000 0 c_function 0 1 0, 10, 20, ... 0 0 8 60 int sqr(int n) { // Return n squared return n * n; } 1 121 SHOW 81 SHOW 1000000 SHOW 0 SHOW 64 HIDE C Program: reversing lines Write a C program that repeatedly reads a line from standard input and prints it in reverse until end-of-file occurs. You may assume lines are at most 80 characters in length and that lines are terminated by newline characters ('\n') with no return characters present.

]]> 1.0000000 0.0000000 0 c_program 0 1 0,10,... 0 0 20 80 char buffer[81]; int readline() { // Read a line into global buffer. Return length of line or -1 if EOF. int c = 0; int i = 0; while ((c = getchar()) != '\n' && c != EOF) { buffer[i++] = c; } return i > 0 || c == '\n' ? i : -1; } int main() { // Read and print lines reversed int numRead = 0; numRead = readline(); while (numRead >= 0) { // Print line backwards for (int i = numRead - 1; i >= 0; i--) { putchar(buffer[i]); } putchar('\n'); numRead = readline(); // Next line } } ]]> 1 Line 1 Line 2 Another line Boring! 1 eniL 2 eniL enil rehtonA !gniroB SHOW abcdefghijklmnopqrstuvwxyz012345 Yes, that was a blank line there 543210zyxwvutsrqponmlkjihgfedcba ereht enil knalb a saw taht ,seY SHOW wow wow SHOW oxen nexo nexo oxen HIDE SHOW Directed graph demo Draw a directed graph with 4 nodes labelled A through D satisfying the following constraints:

  1. All nodes have an in-degree of 1
  2. All edges have positive integer edge weights.
  3. The weights of the in edges of nodes A through D are 1 through 4 respectively.
  4. Node D has an out-degree of zero.
  5. There is a cycle of length 3 with a total edge weight of 6.
  6. There is a path from A to D with a total edge weight of 9.

]]> 1.0000000 0.0000000 0 directed_graph 0 1 10, 20, ... 0 0 18 100 1 # Checking there are exactly # 4 nodes, 'A', 'B', 'C', 'D' OK SHOW # Checking all nodes have in-degree of 1 # and edge weights are 1, 2, 3 and 4 OK SHOW # Checking outdegree of node D is 0 OK SHOW # Checking for the expected cycle and # path to D OK SHOW Java Class: bod Write a Java class Bod, representing a person, to satisfy the following requirements:

  1. There is a constructor that takes two parameters: a String name, being the name of the person, and an int age, being the age of the person.
  2. There are getter methods getName() and getAge() that return the person's name and age respectively.
  3. This is a method growOlder(nYears) that increments the persons age by nYears (an integer).

]]> 1.0000000 0.0000000 0 java_class 0 1 0,10,20,... 0 0 25 80 public class Bod { private String name; private int age; public Bod(String name, int age) { this.name = name; this.age = age; } public String getName() { return this.name; } public int getAge() { return this.age; } public void growOlder(int nYears) { this.age += nYears; } } 1 James 23 James 36 SHOW Angus McGurkinshaw 99 Angus McGurkinshaw 101 SHOW Angus McGurkinshaw 99 Angus McGurkinshaw 102 HIDE Java method: sum of squares Write a Java method with signature int sumSquares(int[] data) that returns the sum of the squares of the elements in a given array of integers. The method must return 0 if the array is empty.

]]> 1.0000000 0.0000000 0 java_method 0 1 0,10,20,... 0 0 8 80 1 int total = sumSquares(new int[] {2, 3, 5}); System.out.println(total); 38 SHOW int total = sumSquares(new int[] {-2, -3, 4, 1}); System.out.println(total); 30 SHOW int total = sumSquares(new int[] {}); System.out.println(total); 0 SHOW int total = sumSquares(new int[] {100}); System.out.println(total); 10000 SHOW int total = sumSquares(new int[] {-9}); System.out.println(total); 81 HIDE Java program: file reader Write a Java program that reads and processes standard input. Each input line is a sequence of one or more integers, separated by commas. For each line of input the program should print the total of the integers in the input line. The program terminates if a blank line is read or if end-of-file occurs.

]]> 1.0000000 0.0000000 0 java_program 0 1 0, 10, 20, ... 0 0 25 80 1 10,20,30 99 shouldn't get here 60 99 SHOW 10,20,30 99 60 99 SHOW 1,2,3,4,5,6,7,8,9,10,11,12 78 SHOW [NB: line above is empty!] SHOW 1 1 SHOW 7 7 HIDE Multilanguage copy stdin to stdout Write a program to copy standard input to standard output

]]> 1.0000000 0.0000000 0 multilanguage 0 1 10, 20, ... 1 0 18 100 int main() { int c; while ((c = getchar()) != EOF) { putchar(c); } }]]> 1 Line1 Line2 Line1 Line2 SHOW Python function that prints: print_squares A function that prints


A common problem for students learning Python is the distinction between functions that return a value ("true" functions) and functions that print output and (preferably) don't return a value ("procedures"). This is an example of the latter.

Write a Python3 function print_sqrs_1_to_n(n) that takes a single positive integer as a parameter and prints a table of all integers and their squares from 1 up to and including n, formatted as below. The output from your function, when called with the code in the Test column, should be exactly as shown in the Result column.

The penalty regime for this question is 5, 15, 25, ... i.e., there is a 5% penalty for the first wrong submission but the penalty thereafter rises by 10% for each wrong submission.

]]> 1.0000000 0.0000000 0 python3 0 1 5, 10, 20, ... 0 0 18 100 1 print_sqrs_1_to_n(5) 1 * 1 = 1 2 * 2 = 4 3 * 3 = 9 4 * 4 = 16 5 * 5 = 25 SHOW print_sqrs_1_to_n(3) 1 * 1 = 1 2 * 2 = 4 3 * 3 = 9 SHOW print_sqrs_1_to_n(1) 1 * 1 = 1 SHOW print_sqrs_1_to_n(10) 1 * 1 = 1 2 * 2 = 4 3 * 3 = 9 4 * 4 = 16 5 * 5 = 25 6 * 6 = 36 7 * 7 = 49 8 * 8 = 64 9 * 9 = 81 10 * 10 = 100 SHOW Python function: sqr Write a Python3 function sqr(n) that returns the square of its numeric parameter n.

For those who don't know Python, one possible answer is:

def sqr(n):
    return n * n

Copy that answer into the answer box and click Check to see how CodeRunner questions behave. Then try changing the answer in various ways and re-checking.

]]> 1.0000000 0.0000000 0 python3 0 1 0, 10, 20, ... 0 0 5 70 def sqr(n): '''The generic sqr function''' return n * n 1 print(sqr(-3)) 9 SHOW print(sqr(11)) 121 SHOW print(sqr(-4)) 16 SHOW print(sqr(0)) 0 SHOW print(sqr(-100)) 10000 HIDE Python program: print welcoming messages Write a Python3 program that repeatedly uses the input() function without a prompt string to read a person's name from standard input and prints a corresponding welcome message until the input line is the string bye, at which point the program exits. The test for bye should be case-insensitive. The welcome message depends only on the first name and whether or not that first name is Richard (case insensitively) as shown in the example table below. The first name is defined to be all text up to but not including the first space or the entire line if no space is present in the line. You may assume the line bye is always present in the input.

]]> 1.0000000 0.0000000 0 python3 0 1 0, 10, 20, ... 0 0 18 100 1 Angus McGurkinshaw III Richard McClashan Richardo McClashan McClashan Richard RICHARD Peter Potter Bye More rubbish Hi Angus Welcome Richard Hi Richardo Hi McClashan Welcome RICHARD Hi Peter SHOW Bye SHOW x y richarD Blogg 101 Dalmations BYE Hi x Hi Hi y Welcome richarD Hi 101 SHOW Bonk Bye Hi Bonk HIDE SQL demo: simple join test Given a database with (at least) two tables: customers and orders as shown below, write an SQL query that returns the order_num, order amount and customer name for all orders between $500 and $2000 inclusive, ordered by order_num.

First 5 rows of customers table, ordered by id

id      name             city          grade   salesperson_id
------  ---------------  ------------  ------  --------------
3001    Brad Guzan       London        100     5005          
3002    Nick Rimando     New York      100     5001          
3003    Jozy Altidore    Moscow        200     5007          
3004    Fabian Johns     Paris         300     5006          
3005    Graham Zusi      California    200     5002

First 5 rows of orders table ordered by order_num

order_num   amount     date        customer_id  saleperson_id
----------  ---------  ----------  -----------  -------------
70001       150.5      2012-10-05  3005         5002         
70002       65.26      2012-10-05  3002         5001         
70003       2480.4     2012-10-10  3009         5003         
70004       110.5      2012-08-17  3009         5003         
70005       2400.6     2012-07-27  3007         5001
]]> 1.0000000 0.0000000 0 sql 0 1 10, 20, ... 0 0 18 100 = 500 and amount <= 2000 order by order_num]]> 1 -- Testing with original db order_num amount name ---------- ---------- --------------- 70007 948.5 Graham Zusi 70010 1983.43 Fabian Johns SHOW -- Testing with extra rows order_num amount name ---------- ---------- --------------- 69007 500.0 Graham Zusi 70007 948.5 Graham Zusi 70010 1983.43 Fabian Johns 70014 2000.0 Jozy Altidore insert into orders values (69007,500,2011-12-31, 3005, 5002); insert into orders values (70014,2000,2012-12-31, 3003, 5001); SHOW 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SQL demo: simple select Given a database with (at least) a table customers as shown below, write an SQL query that returns the name, city and grade of all customers who live in London or Paris, in ascending order of name.

First 5 rows of customers table, ordered by id

id      name             city          grade   salesperson_id
------  ---------------  ------------  ------  --------------
3001    Brad Guzan       London        100     5005          
3002    Nick Rimando     New York      100     5001          
3003    Jozy Altidore    Moscow        200     5007          
3004    Fabian Johns     Paris         300     5006          
3005    Graham Zusi      California    200     5002

]]> 1.0000000 0.0000000 0 sql 0 1 10, 20, ... 0 0 18 100 select name, city, grade from customers where city = 'London' or city = 'Paris' order by name 1 -- Testing with original db name city grade --------------- ---------- ----- Brad Guzan London 100 Fabian Johns Paris 300 Julian Green London 300 SHOW -- Testing with extra rows name city grade --------------- ---------- ----- Angus McGee Paris 500 Brad Guzan London 100 Fabian Johns Paris 300 Julian Green London 300 insert into customers values (2999, 'Angus McGee', 'Paris', 500, 6001); SHOW 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Undirected graph demo, using Undirected graph question type directly Draw an undirected graph with two nodes labelled A and B that are connected by a single edge with label greek epsilon. This version inherits the template, template parameters and UI spec from the question type.

]]> 1.0000000 0.0000000 0 undirected_graph 0 1 10, 20, ... 0 0 18 100 1 [('A', [('B', '\\epsilon')]), ('B', [('A', '\\epsilon')])] print(sorted(graph.items())) SHOW Undirected graph trivial demo, customised from Python3 question Draw a graph with two nodes A and B connected by an edge labelled with an epsilon.

]]> 1.0000000 0.0000000 0 python3 0 1 10, 20, ... 0 0 18 100 0 1 #\n|ms]]> EqualityGrader graph OK SHOW