Let’s begin with some basic understanding of the 2-dimensional array.
How to declare and use 2-dimensional Arrays?
Example 1: int x[2][3] = {{4, 2, 3}, {9, 6, 7}};
Example 2: int x[3][4] = {{4, 2, 3, 9}, {9, 6, 7, 2}, {3, 4, 7, 8}};
Example of different ways to initialize two dimensional array are mentioned below;
int array[2][3] = {{9, 3, 0}, {7, 5, 9}};
int array[][3] = {{3, 3, 0}, {-1, 5, 9}};
int array[2][3] = {5, 3, 5, 8, 5, 4};
2 Dimensional Arrays Program in C / C++
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#include<iostream> using namespace std; int main() { // an array with 3 rows and 2 columns. int x[3][2] = {{6,4}, {8,7}, {1,9}}; // Displaying of array element's value for (int i = 0; i < 3; i++) { for (int j = 0; j < 2; j++) { cout << "Element at x[" << i << "][" << j << "]: "; cout << x[i][j]<<endl; } } return 0; } |
Output:
Element at x[0][0]: 6
Element at x[0][1]: 4
Element at x[1][0]: 8
Element at x[1][1]: 7
Element at x[2][0]: 1
Element at x[2][1]: 9
Sum of two arrays using Two dimensional arrays
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// C program to find the sum of two arrays #include <stdio.h> int main() { float array1[2][2], array2[2][2], array3[2][2]; // array1 have two rows and two collumn // array2 have two rows and two collumn // array3 have two rows and two collumn int i, j; // Taking input using nested for loop printf("Enter elements for array1 \n"); for(i=0; i<2; ++i) for(j=0; j<2; ++j) { printf("Enter a%d%d: ", i+1, j+1); scanf("%f", &array1[i][j]); } // Taking input using nested for loop printf("Enter elements for array2\n"); for(i=0; i<2; ++i) for(j=0; j<2; ++j) { printf("Enter b%d%d: ", i+1, j+1); scanf("%f", &array2[i][j]); } // adding corresponding elements of two arrays for(i=0; i<2; ++i) for(j=0; j<2; ++j) { Array3[i][j] = array1[i][j] + array2[i][j]; } // Displaying the sum printf("\n Overall Sum Of full Matrix is:"); for(i=0; i<2; ++i) for(j=0; j<2; ++j) { printf("%.1f\t", array3[i][j]); if(j==1) printf("\n"); } return 0; } |
Output
Enter elements for array1
Enter a11: 42;
Enter a12: 2;
Enter a21: -8;
Enter a22: 4;
Enter elements for array2
Enter b11: 3;
Enter b12: 2;
Enter b21: 2;
Enter b22: 3;
Overall Sum Of full Matrix is:
7 5
10 7
Comparison Between one and two Dimensional Array
1-DIMENSIONAL: Store a single list of elements. Store only similar elements with the same data type.
2-DIMENSIONAL: Store ‘list of lists’ or ‘array of arrays’ or ‘array of 1-dimensional arrays’.
Comparison of Declaration Between one and two Dimensional Array
1-DIMENSIONAL: How to declare in C++? type variable_name[ size ];
2-DIMENSIONAL: How to declare in C++. type variable_name[size1][size2];
Comparison of Receiving parameter Between one and two Dimensional Array
1-DIMENSIONAL: Parameters can be received in the followings;
- sized array
- unsized array
- Pointer
2-DIMENSIONAL: It must define the rightmost dimension of an array.
Comparison of Total Size occupies in Bytes Between one and two Dimensional Array
1-DIMENSIONAL:Total Bytes =sizeof(datatype of array variable)* size of array.
2-DIMENSIONAL: Total Bytes= sizeof(datatype of array variable)* size of the first index*size of the second index.