COMP1721 - Higher Computing 1B

1. Does the C compiler require that programs be indented or otherwise formatted?

2. True or false?
   • Anything that is between /* and */ is interpreted as a comment by the compiler.
   • Everything after -- on a line is treated as a comment.
   • Variables must always be declared before they are used
   • A compound statement (a list of statements enclosed in curly braces {}) can be placed anywhere in a program where a single statements.

3. What would be the result of compiling and executing this C?

   /* The meaning of life is:
   printf("%d\n", 6*7);
   
   
   

4. Which of these are legal C variable names and why?
   • forty
   • forty_two
   • forty two
   • forty#two
   • 42
   • f42
   • while

5. What would be the result of compiling and executing this C?

   
   answer = 42;
   printf("%d\n", answer);
   

6. What would be the result of compiling and executing this C?

   int x, y;
   x = 15;
   y = x;
   x = 27;
   printf("%d\n", y);
   

7. What would be the result of compiling and executing this C?

   int x;
   x = "hello world";
   printf("%d\n", x);
   

8. What would be the result of compiling and executing this C?

   int x;
   x = 42;
   printf("%d\n", X);
   

9. Write C statements that read two numbers and prints their product. Emulate this behaviour.

   % a.out
   Enter first number: 6
   Enter second number: 7
   The product of 6 and 7 is 42
   

10. Write C statements that will print 100 times:

    	I must not talk during lectures.
    

11. Write a Haskell function sigma that given two inputs n and m computes the sum of the integer values from n and m.

    Write C statements to do the same task, i.e. compute the sum of integer values from n to m and print the result.

    Assume that the values n and m are in variable of the same name declared elsewhere.

12. Write a Haskell script to calculate the n-th tetrahedral number. The n-th tetrahedral number is the sum of the numbers:

            1
            1 2
            1 2 3
            1 2 3 4
    
             .....
    
            1 2 3 4  .... n
    

    The first few tetrahedral numbers are:

            1, 4, 10, 20, 35
    

    Write C statements which print the first 100 tetrahedral numbers.