• Week 8: Arrays as parameters
  • Arrays as parameters
• Week 9: Strings, gambling
  • Strings
  • Gambling
• Week 10: 2-d arrays, pointers
  • 2-d arrays
  • Pointers
• Week 11: Macros and the ?: Operator
  • Macros and the ?: Operator

You should also review your work for the programming assignments:

• Prog 6: Inserting into a List
• Prog 7: Chutes and Ladders
• Prog 8: Random Walk in the Plane

1. Array initialization with curley brackets:

   
   // initialize array named primes to the first 7 primes
   int primes[] = {2, 3, 5, 7, 11, 13, 17};
   

   Question: Use a for loop to add up the squares of the primes stored in the array in 2 above. Print the sum.
   Solution. (Don't access until you've tried the problem.)

2. for loops and arrays: For loops go hand-in-hand with arrays, so I may use such an example as a loop to set all elements of an array to zero:

   
   int a[25];
   int i;
   for (i = 0; i < 25; i++)
      a[i] = 0;
   

   Question: Here is a practice problem: Problem involving arrays.
   Solution. (Don't access until you've tried the problem.)

3. Use of arrays as parameters: Write a main function that will:
   • declare an integer array a of size 40.
   • pass a to a function squares that will initialize each element a[i] with i*i.
   • pass this initialized array a to a function printarray that will print the elements of the array.
   • pass this initialized array a to another function addup that will add all the elements of the array and return the sum as an integer.
   • within main print the value of the sum as returned from the function addup.

4. 2-dimensional arrays: Write a program that will use 2-dimensional arrays to print a 16-by-16 multiplication table. Use an array m, that is declared int m[17][17];. Use a separate function to initialize m[i][i]; to i*j. Then use another function to print the array, skipping the entries for i = 0 and for j = 0.

5. Start with an array declared in main by:

   int a[] = {12, 34, 21, 47, 52, 7, 41};
   int asize = 7;
   

   Pass this array and its size to a function maxmin that will calculate both the maximum and the minimum value in the array. The function should have two formal parameters max and min, each of type int  *, that is, a pointer to an integer, or the address of an integer. Use these parameters to get the maximum and minimum values back to the function main, where they should be printed. (You must pass the addresses of two ordinary integers as the actual parameters.)

6. Write a macro STARS that will take i and will print i stars with no newline. (Go ahead and put a for loop and a printf or a putchar inside the macro. In standard C you'll have to declare the loop index separately, but not in C++.)