• Week 10: Arrays from the text

• Week 7: Arrays
  • This page gives an introduction to arrays using as an extended example a program to count the outcome of rolling one die and then two dice. Arrays
  • This page gives an introductory example of reading into an array, and calculating various quantities from these numbers. Loops and Arrays
  • This page shows more complex array examples, and then shows the use of arrays as parameters. Arrays as parameters

• Week 7: Random Numbers
  • Two example programs (4th and 5th from the last): Examples
  • Far more about random number generators than you want to know: Random Numbers

• Week 8: Arrays as parameters
  • Arrays as parameters

• Week 9: 2-dim arrays
  • Multiplication table: table
  • 2-dimensional arrays: 2-dimensional arrays

• Week 11: Functions and Data
  • Changing a simple parameter inside a function: A simple parameter
  • A similar program using a global variable: A global variable
  • Using an array as a parameter: Arrays as parameters

You should also review your work for the programming assignments:

• Prog 6: Numerical Integration
• Prog 7: Arrays: Sorting, Shuffling
• 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: Write a main function that will:
   1. declare an integer array a of size 40.
   2. initialize each element a[i] with i*i.
   3. print the elements of the array.
   4. add all the elements of the array and leave the sum as a variable sum.
   5. print the value of the sum.
   Solution. (Don't access until you've tried the problem.)

4. Use of arrays as parameters: Redo the previous problem using functions with the array as a parameter. In detail, write a main function that will:
   1. declare an integer array a of size 40.
   2. pass a to a function squares that will initialize each element a[i] with i*i.
   3. pass this initialized array a to a function printarray that will print the elements of the array.
   4. 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.
   5. within main print the value of the sum as returned from the function addup.
   Solution. (Don't access until you've tried the problem.)