What Is C Multidimensional Arrays

Multidimensional Arrays


In C programming, you can create an array of arrays. These arrays are known as multidimensional arrays. For example,
  1. float x[3][4];
Here, x is a two-dimensional (2d) array. The array can hold 12 elements. You can think the array as a table with 3 rows and each row has 4 columns.
Two dimensional array in C programming
Similarly, you can declare a three-dimensional (3d) array. For example,
  1. float y[2][4][3];
Here, the array y can hold 24 elements.

Initializing a multidimensional array

Here is how you can initialize two-dimensional and three-dimensional arrays:

Initialization of a 2d array

  1. // Different ways to initialize two-dimensional array
  2. int c[2][3] = {{1, 3, 0}, {-1, 5, 9}};
  3. int c[][3] = {{1, 3, 0}, {-1, 5, 9}};
  4. int c[2][3] = {1, 3, 0, -1, 5, 9};

Initialization of a 3d array

  1. int test[2][3][4] = {
  2. {{3, 4, 2, 3}, {0, -3, 9, 11}, {23, 12, 23, 2}},
  3. {{13, 4, 56, 3}, {5, 9, 3, 5}, {3, 1, 4, 9}}};

Example 1: Two-dimensional array to store and print values

  1. // C program to store temperature of two cities of a week and display it.
  2. #include <stdio.h>
  3. const int CITY = 2;
  4. const int WEEK = 7;
  5. int main()
  6. {
  7. int temperature[CITY][WEEK];
  8. // Using nested loop to store values in a 2d array
  9. for (int i = 0; i < CITY; ++i)
  10. {
  11. for (int j = 0; j < WEEK; ++j)
  12. {
  13. printf("City %d, Day %d: ", i + 1, j + 1);
  14. scanf("%d", &temperature[i][j]);
  15. }
  16. }
  17. printf("\nDisplaying values: \n\n");
  18. // Using nested loop to display vlues of a 2d array
  19. for (int i = 0; i < CITY; ++i)
  20. {
  21. for (int j = 0; j < WEEK; ++j)
  22. {
  23. printf("City %d, Day %d = %d\n", i + 1, j + 1, temperature[i][j]);
  24. }
  25. }
  26. return 0;
  27. }
Output
City 1, Day 1: 33
City 1, Day 2: 34
City 1, Day 3: 35
City 1, Day 4: 33
City 1, Day 5: 32
City 1, Day 6: 31
City 1, Day 7: 30
City 2, Day 1: 23
City 2, Day 2: 22
City 2, Day 3: 21
City 2, Day 4: 24
City 2, Day 5: 22
City 2, Day 6: 25
City 2, Day 7: 26

Displaying values: 

City 1, Day 1 = 33
City 1, Day 2 = 34
City 1, Day 3 = 35
City 1, Day 4 = 33
City 1, Day 5 = 32
City 1, Day 6 = 31
City 1, Day 7 = 30
City 2, Day 1 = 23
City 2, Day 2 = 22
City 2, Day 3 = 21
City 2, Day 4 = 24
City 2, Day 5 = 22
City 2, Day 6 = 25
City 2, Day 7 = 26

Example 2: Sum of two matrices

  1. // C program to find the sum of two matrices of order 2*2
  2. #include <stdio.h>
  3. int main()
  4. {
  5. float a[2][2], b[2][2], result[2][2];
  6. // Taking input using nested for loop
  7. printf("Enter elements of 1st matrix\n");
  8. for (int i = 0; i < 2; ++i)
  9. for (int j = 0; j < 2; ++j)
  10. {
  11. printf("Enter a%d%d: ", i + 1, j + 1);
  12. scanf("%f", &a[i][j]);
  13. }
  14. // Taking input using nested for loop
  15. printf("Enter elements of 2nd matrix\n");
  16. for (int i = 0; i < 2; ++i)
  17. for (int j = 0; j < 2; ++j)
  18. {
  19. printf("Enter b%d%d: ", i + 1, j + 1);
  20. scanf("%f", &b[i][j]);
  21. }
  22. // adding corresponding elements of two arrays
  23. for (int i = 0; i < 2; ++i)
  24. for (int j = 0; j < 2; ++j)
  25. {
  26. result[i][j] = a[i][j] + b[i][j];
  27. }
  28. // Displaying the sum
  29. printf("\nSum Of Matrix:");
  30. for (int i = 0; i < 2; ++i)
  31. for (int j = 0; j < 2; ++j)
  32. {
  33. printf("%.1f\t", result[i][j]);
  34. if (j == 1)
  35. printf("\n");
  36. }
  37. return 0;
  38. }
Output
Enter elements of 1st matrix
Enter a11: 2;
Enter a12: 0.5;
Enter a21: -1.1;
Enter a22: 2;
Enter elements of 2nd matrix
Enter b11: 0.2;
Enter b12: 0;
Enter b21: 0.23;
Enter b22: 23;

Sum Of Matrix:
2.2     0.5
-0.9    25.0

Example 3: Three-dimensional array

  1. // C Program to store and print 12 values entered by the user
  2. #include <stdio.h>
  3. int main()
  4. {
  5. int test[2][3][2];
  6. printf("Enter 12 values: \n");
  7. for (int i = 0; i < 2; ++i)
  8. {
  9. for (int j = 0; j < 3; ++j)
  10. {
  11. for (int k = 0; k < 2; ++k)
  12. {
  13. scanf("%d", &test[i][j][k]);
  14. }
  15. }
  16. }
  17. // Printing values with proper index.
  18. printf("\nDisplaying values:\n");
  19. for (int i = 0; i < 2; ++i)
  20. {
  21. for (int j = 0; j < 3; ++j)
  22. {
  23. for (int k = 0; k < 2; ++k)
  24. {
  25. printf("test[%d][%d][%d] = %d\n", i, j, k, test[i][j][k]);
  26. }
  27. }
  28. }
  29. return 0;
  30. }
Output
Enter 12 values: 
1
2
3
4
5
6
7
8
9
10
11
12

Displaying Values:
test[0][0][0] = 1
test[0][0][1] = 2
test[0][1][0] = 3
test[0][1][1] = 4
test[0][2][0] = 5
test[0][2][1] = 6
test[1][0][0] = 7
test[1][0][1] = 8
test[1][1][0] = 9
test[1][1][1] = 10
test[1][2][0] = 11
test[1][2][1] = 12

Post a Comment

0 Comments