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C Basics

bookTwo Dimensional Arrays

Two-dimensional arrays are a bit like tables, think of them as arrays within arrays, with rows and columns. Declaring a two-dimensional array requires an extra set of square brackets:

int array[ROWS][COLUMNS];

Imagine a table where:

  • Row a[0]... represents the first set of data or the first array;
  • Row a[1]... is the second set;
  • Row a[2]... is the third.

When an array is placed inside another array, it's called a nested array. To access its elements, use multiple indices, each enclosed in its own set of brackets.

main.c

main.c

copy

              
123456789101112131415

            
#include <stdio.h> 

int main() {
	// dimensional array declaration
	int array[3][4] = { 
						{1, 11, 111, 1111}, // Index `[0]`
						{2, 22, 222, 2222}, // Index `[1]`
						{3, 33, 333, 3333} // Index `[2]`
	};

    // Print the first element of the second nested array
	printf("%d", array[1][0]); 

	return 0;
}
Note
Note

All elements within an array must be of the same type.

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Sektion 2. Kapitel 5

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bookTwo Dimensional Arrays

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Two-dimensional arrays are a bit like tables, think of them as arrays within arrays, with rows and columns. Declaring a two-dimensional array requires an extra set of square brackets:

int array[ROWS][COLUMNS];

Imagine a table where:

  • Row a[0]... represents the first set of data or the first array;
  • Row a[1]... is the second set;
  • Row a[2]... is the third.

When an array is placed inside another array, it's called a nested array. To access its elements, use multiple indices, each enclosed in its own set of brackets.

main.c

main.c

copy

              
123456789101112131415

            
#include <stdio.h> 

int main() {
	// dimensional array declaration
	int array[3][4] = { 
						{1, 11, 111, 1111}, // Index `[0]`
						{2, 22, 222, 2222}, // Index `[1]`
						{3, 33, 333, 3333} // Index `[2]`
	};

    // Print the first element of the second nested array
	printf("%d", array[1][0]); 

	return 0;
}
Note
Note

All elements within an array must be of the same type.

question mark

What is the output of this code?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 5
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