Lesson 9.3. Multidimensional arrays

Syntax

In C, it is possible to create multidimensional arrays by specifying the size of each dimension in square brackets one after the other:

int tab[3][4];

The line above declares a table of 3 rows by 4 columns, that is 12 cells in total.

Note: theoretically, the number of dimensions is not limited. In practice, however it depends on the compiler and the available memory.

Exercise

The following multidimensional table is provided:

  char Hi[7][11] = {  {32,32, 95,32 ,32,32,32 ,95,32 ,95,32 },
                      {32,124,32,124,32,32,124,32,40 ,95,41 },
                      {32,124,32,124,95,95,124,32,124,95,32 },
                      {32,124,32,32 ,95,95,32 ,32,124,32,124},
                      {32,124,32,124,32,32,124,32,124,32,124},
                      {32,124,95,124,32,32,124,95,124,95,124},
                      {32,32 ,32,32 ,32,32,32 ,32,32 ,32,32 } };

Display each value of the table as a character respecting the layout row / columns. Here is the display of the first two lines expected:

  _    _ _ 
 | |  | (_)
 

#include <stdio.h> int main(void) { // Variables to iterate rows and columns int l,c; // Declaration and initialization of a multidimensional array char Hi[7][11] = { {32,32, 95,32 ,32,32,32 ,95,32 ,95,32 }, {32,124,32,124,32,32,124,32,40 ,95,41 }, {32,124,32,124,95,95,124,32,124,95,32 }, {32,124,32,32 ,95,95,32 ,32,124,32,124}, {32,124,32,124,32,32,124,32,124,32,124}, {32,124,95,124,32,32,124,95,124,95,124}, {32,32 ,32,32 ,32,32,32 ,32,32 ,32,32 } }; // Display each value of the table // as a character // respecting the layout row / columns**. // COMPLETE HERE return 0; }

Quiz

Which syntaxes declare an array of 5 columns by 4 rows?

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What is the size of the following array:

char carre[10][10];

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What is the size of the following array:

unsigned char image[200][300][3];

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See also

• Learn C programming
• Lesson 1.1. History of C programming language
• Lesson 1.2. First program
• Lesson 1.3. Compilation
• Lesson 1.4. Preprocessor directives
• Lesson 1.5. Which compiler to choose?
• Lesson 1.6. Flowchart
• Lesson 2.1. Types and variables
• Lesson 2.2. Integers
• Lesson 2.3. Floating point numbers
• Lesson 2.4. Characters
• Lesson 2.5. Variables initialization
• Lesson 2.6. Ariane flight 501
• Lesson 3.1. Arithmetic operators
• Lesson 3.2. modulo
• Lesson 3.3. Operators and types
• Lesson 3.4. Type casting
• Lesson 3.5. Bitwise operators
• Lesson 3.6. Bitwise operators details
• Lesson 3.7. Shifting operators
• Lesson 3.8. Assignment operators
• Lesson 3.9. Increment and decrement operators
• Lesson 3.10. Comparison operators
• Lesson 3.11. Logical operators
• Lesson 3.12. Operator precedence
• Lesson 4.1. printf
• Lesson 4.2. scanf
• Lesson 4.3. putchar
• Lesson 5.1. Conditional branching (if...else)
• Lesson 5.2. Nested if and indentation
• Lesson 5.3. Checking intervals
• Lesson 5.4. Ternary Operator ?:
• Lesson 5.5. switch..case statement
• Lesson 5.6. Break keyword in switch..case
• Lesson 6.1. do..while loop in C
• Lesson 6.2. While loop in C
• Lesson 6.3. For loop in C
• Lesson 6.4. How to choose the right loop in C ?
• Lesson 6.5. Exercices on loops in C
• Lesson 7.1. Bit masking
• Lesson 7.2. Bit masking, how to clear a bit in C?
• Lesson 7.3. Bit masking, how to set a bit in C?
• Lesson 7.4. Bit masking, how to toggle a bit in C?
• Lesson 7.5. Bit masking, how to check a single bit in C?
• Lesson 7.6. Overview of bit masking
• Lesson 8.1. Basic syntax of C functions
• Lesson 8.2. Calling C functions
• Lesson 8.3. Void keyword
• Lesson 8.4. Return keyword
• Lesson 8.5. Variable scope
• Lesson 8.6. Global variables
• Lesson 8.7. Static variables
• Lesson 8.8. Random numbers in C
• Lesson 8.9. Mathematical functions in C
• Lesson 9.1. Syntax of C arrays
• Lesson 9.2. Array initialization
• Lesson 9.4. How C arrays are stored in memory?
• Lesson 9.5. Arrays and functions
• Lesson 9.6. Exercises on C arrays
• Lesson 10.1. Strings in C
• Lesson 10.2. Null terminated string
• Lesson 10.3. The string.h library
• Lesson 10.4. String and functions
• Lesson 11.1. Introduction to pointers in C
• Lesson 11.2. Syntax of C pointers
• Lesson 11.3. Dynamic memory allocation
• Lesson 11.4. Incrementing pointers
• Lesson 11.5. Pointers as function argument in C
• Lesson 12.1. Introduction to structures in C
• Lesson 12.2. Properties of structures in C
• Lesson 12.3. Structures and pointers
• Lesson 12.4. Structures and functions
• Lesson 13.1. Recursive functions in C
• Lesson 13.2. Depth of recursive functions
• Lesson 13.2. Mutual recursion
• Lesson 14.1. Additional exercises

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