Understanding Arrays and Named Constants in C++
This lecture explains the benefits of using named constants as array size declarators, emphasizing how they improve program maintenance when changing array sizes. It defines array subscripts and illustrates array element access using constant, literal, and variable subscripts. A general format for accessing array elements is provided. Additionally, a sample C++ program is presented, which prompts users to enter hours worked by six employees, stores these values in an array, and displays the entered hours.
Understanding Arrays and Named Constants in C++
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Presentation Transcript
13/4/1435 h Lecture 2 Accessing Array’s Elements
Named Constants • Q: Mention the benefits of named constants when used as an array size declarator, give an example? • This eases program maintenance when the size of the array needs to be changed. • Ex: const int SIZE = 5; int tests[SIZE];
Q: Define array’s subscripts? • Each element in an array is assigned a unique subscript. • Subscripts start at 0 • The last element’s subscript is n-1 where n is the number of elements in the array. subscripts:
Q: How can we access array’s elements ? By using : • A constant or literal subscript: EX : • Integer expression as subscript: EX cout << tests[3] << endl; • int i = 5; • cout << tests[i] << endl;
Q : Write a general Format for accessing array’s Elements cout<< or cin >> Array Name [Array Subscript]; OR Array Name [integer Number];
Q: Write a c++ program that asks for the number of hours worked by 6 employee and stores the values in an array #include<iostream> using namespace std; int main( ) { const int num_emp = 6; int hours[num_emp]; cout<<“enter the hours worked by 6 employees”;
. // Get the hours worked by each employee cin>>hours[0]; cin>>hours[1]; cin>>hours[2]; cin>>hours[3]; cin>>hours[4]; cin>>hours[5]; //Display the values in the array Cout<<“the values you entered are:”
. cout<< “ “ <<hours[0]; cout<< “ “ <<hours[1]; cout<< “ “ <<hours[2]; cout<< “ “ <<hours[3]; cout<< “ “ <<hours[4]; cout<< “ “ <<hours[5]<<endl; return 0; }
Program output with example of input Here are the contents of the hours array, with the values entered by the user in the example output:
