How to Use C Arrays in C++
A C array is a data structure that stores many elements of the same data type. C arrays, when you use them in C++, are called "dumb" arrays. Arrays store default data types or user-defined ones in a contiguous area of memory. You can access an element via indexing, where the index is a positive integer that indicates the element's position, counting from zero.
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Instructions
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1
Use the following convention to declare an array. Write the data type, use a name to designate the array and indicate the number of the elements inside square brackets. End the line with a semicolon.
int arr1[5];
int arr2[5] = {0}; // arr2 has all zeros. -
2
Populate the array with data or initialize the array. Use indexing to assign elements to the various locations inside the array. Access the first location using an index of zero. Access the last location using an index of n minus one, where n is the length of the array:
arr1[0] = 4; // puts 4 in the first location
arr1[2] = 32; // puts 32 in the middle location
arr1[4] = 17; // puts 17 in the last location -
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3
Retrieve an element from the array. This is the reverse of Step 3:
int elem = arr1[4]; // Now elem has the value of 17. -
4
Iterate across an array and print its elements on the console, also known as the standard output. Place the following sample inside the main() function and compile the program:
for( int i = 0; i < 5; i++ ) {
std::cout << "Elem " << i << ":" << arr1[i] << std::cout;
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5
Observe the output:
Elem 1: 4
Elem 2: 0
Elem 3: 32
Elem 4: 0
Elem 5: 17
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Tips & Warnings
This tutorial demonstrated one-dimensional arrays. You could also make arrays that have two or more dimensions.
In C, strings are implemented as arrays of type char.
C arrays have a fixed size and can't be resized.
Proper indexing is the programmer's responsibility. The value of the index must always be zero or positive and can never exceed the n minus 1 limit. When this rule is violated, compiler errors or run-time exceptions occur.
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Comments
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I need help and how to write an array program.
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tnx 4 the info....
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teach on
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this is a great site for programmers.
