Syntax for lab 4

Key syntax elements for lab 4

The C++ feature we will add for lab 4 is arrays. (Refer back to the course notes or to the lab 3 syntax examples for refreshers on the syntax used earlier.)

Introductory C++ array syntax:

Declaring an array of a fixed size

// create an array of 10 doubles
const int ArrSize = 10;
double myArray[ArrSize];

Declaring and initializing an array simultaneously

// create and initialize an array of 3 floats
const int ASize = 3;
float arr[ASize] = { 10.5, 6.123, 3.14 };

Assigning/putting a value in one array position

myArray[4] = 1.0;  // put the value one in array position 4

Accessing/using a value in one array position

float x = arr[1]; // copy a value from array position 1 to variable x

Using a loop to access all the elements of an array

// put the value 0.5 in each position of the array
for (int pos = 0; pos < ArrSize; pos++) {
   myArray[pos] = 0.5;
}

Passing an array as a parameter to a function

// prototype for a function to print the contents of an array
void printArray(double arr[], int size);

// ... suitable call to the function from somewhere inside main
   printArray(myArray, ArrSize);