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Questions and Answers
What is the general declaration of one-dimensional arrays in C++?
What is the general declaration of one-dimensional arrays in C++?
How can the elements of a one-dimensional array be initialized?
How can the elements of a one-dimensional array be initialized?
What is the purpose of the index in an array?
What is the purpose of the index in an array?
What is the output of the following code: int x [] = { 12, 3, 5, 0, 11, 7, 30, 100, 22 };?
What is the output of the following code: int x [] = { 12, 3, 5, 0, 11, 7, 30, 100, 22 };?
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How can you access the first element of an array?
How can you access the first element of an array?
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What is the result of the following code: cin >> mark[i-1]; where i is 2 and the input value is 20?
What is the result of the following code: cin >> mark[i-1]; where i is 2 and the input value is 20?
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What is the output of the following code: cout > mark[i-1]; where i is 2?
What is the output of the following code: cout > mark[i-1]; where i is 2?
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What is the purpose of the code int numbers = {7, 5, 6, 12, 35};?
What is the purpose of the code int numbers = {7, 5, 6, 12, 35};?
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Study Notes
One-Dimensional Array
- A one-dimensional array is a single variable that stores multiple elements of the same data type.
- The general declaration of a one-dimensional array is:
dataType arrayName[arraySize]; - Each element in an array is called an element, and they are all of the same type, with only the values varying.
Initializing Array Elements
- Array elements can be initialized in several ways, including:
- Assigning a value to the first element of an array:
age = 18; - Assigning a value to the last element of an array:
age = 19; - Assigning values to all elements of an array:
age = { 18, 17, 18, 19, 20, 17, 18, 16, 19 }; - Using an initialization list:
int x[] = { 12, 3, 5, 0, 11, 7, 30, 100, 22 };
- Assigning a value to the first element of an array:
Accessing Array Elements
- Array elements can be accessed using the array name followed by brackets
[]containing the array index. - The array index is a variable or constant that specifies the element to be accessed.
- Examples of accessing array elements include:
- Assigning the first element of an array to a variable:
x = num[0]; - Printing the second element of an array:
cout << num[1]; - Using a loop to access array elements:
for (int i = 0; i < 5; i++) { ... } - Taking input from the user and inserting it into the ith index of an array:
cin >> mark[i-1];
- Assigning the first element of an array to a variable:
Example Program
- A C++ program to read a 1-D array and print it:
#include
int main() {
int numbers[] = {7, 5, 6, 12, 35};
cout << numbers[0]; // prints the first element of the array
return 0;
}
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Description
Learn about one-dimensional arrays, their declaration, and initialization in programming languages. Understand the elements and data types of arrays.
