SPL 12 | Multi-dimensional Array in C
0 likes166 views
This document discusses two dimensional arrays in a structured programming language. It defines a two dimensional array as an array of one dimensional arrays that can store elements in rows and columns. The document provides examples of declaring and initializing 2D arrays with data types, maximum rows and columns. It demonstrates how to access elements, take input and output the elements of a 2D array using loops and indexing.
![Declaration
int x ; ///declaring integer type variable x
int x[100] ; ///declaring 1D array of 100 integers](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-6-320.jpg)
![Declaration
int x ; ///declaring integer type variable x
int x[100] ; ///declaring 1D array of 100 integers
int x[100] [50] ; ///declaring 100 1D array each of 50 integers
///i.e. a 2D array of 100 rows and 50 columns](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-7-320.jpg)
![Declaration
int x ; ///declaring integer type variable x
int x[100] ; ///declaring 1D array of 100 integers
int x[100] [50] ; ///declaring 100 1D array each of 50 integers
///i.e. a 2D array of 100 rows and 50 columns
datatype arrayName [Max_rows][Max_cols] ;
• datatype = any valid C data type.
• arrayName = any valid C identifier.](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-8-320.jpg)
![2 D Array
int a[Max_rows] [Max_cols] ;
a[0][0] a[0][1] a[0][2] a[0][3]
a[1][0] a[1][1] a[1][2] a[1][3]
a[2][0] a[2][1] a[2][2] a[2][3]
Col 0 Col 1 Col 2 Col 3 Max_cols-1
Row 0
Row 1
Row 2
Max_rows-1](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-9-320.jpg)
![Initialization
int arr[3][4]={1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
int arr[3][4]={
{1,2,3,4},
{5,6,7,8},
{9,10,11,12}
};
Or, 1 2 3 4
5 6 7 8
9 10 11 12](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-10-320.jpg)
![Accessing 2D array
1 2 3 4
5 6 7 8
9 10 11 12
Row 1 >>>
Col 1
int var=arr[1][1]; /// the value of variable var is 6](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-11-320.jpg)
![Accessing 2D array
1 2 3 4
5 6 7 8
9 10 11 12
Row 1 >>>
Col 1
int var=arr[1][1]; /// the value of variable var is 6
scanf("%d",&arr[2][3]); /// let, input is 100
printf("%d",arr[2][3]);
100](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-12-320.jpg)
![Accessing 2D array
1 2 3 4
5 6 7 8
9 10 11 12
Row 1 >>>
Col 1
int var=arr[1][1]; /// the value of variable var is 6
scanf("%d",&arr[2][3]); /// let, input is 100
arr[0][0] = 20 ;
printf("%d",arr[2][3]);
100
20](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-13-320.jpg)
![Taking Input
#include <stdio.h>
#define ROW 5
#define COL 3
int main()
{
int arr[ROW][COL];
int r,c;
for(r=0;r<ROW;r++){
for(c=0;c<COL;c++){
scanf("%d", &arr[r][c]);
}
}
printf("Completedn");
///other codes......
return 0;
}](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-14-320.jpg)
![Showing 2D array
int r,c;
for(r=0;r<ROW;r++){
for(c=0;c<COL;c++){
printf("%d ",arr[r][c]);
}
printf("n"); ///showing the next row in a different line
}](https://image.slidesharecdn.com/2darrayinc-200320074621/85/SPL-12-Multi-dimensional-Array-in-C-15-320.jpg)
SPL 12 | Multi-dimensional Array in C
- 1. Structured Programming Language 2 Dimensional Array Mohammad Imam Hossain, Lecturer, CSE, UIU
- 2. Array • A data structure that can store a fixed- size sequential collection of elements of same type. • More useful to think as a collection of variables of the same type. • Arrays we have consider up to now are one dimensional arrays, a single line of elements.
- 3. Programming Language Rating 90 85 85 90 80 20 20 95 90 85 80 90 30 10 C C++ C# java python ruby perl Columns representing programming languages Differentpersons
- 4. Why 2 D • Matrix calculator • Any kind of board game (chess, tic-tac-toe, number puzzle, word puzzle, minesweeper etc.) • Graph representation • Image representation • Excel data • Database table to store information etc………
- 5. Declaration int x ; ///declaring integer type variable x
- 6. Declaration int x ; ///declaring integer type variable x int x[100] ; ///declaring 1D array of 100 integers
- 7. Declaration int x ; ///declaring integer type variable x int x[100] ; ///declaring 1D array of 100 integers int x[100] [50] ; ///declaring 100 1D array each of 50 integers ///i.e. a 2D array of 100 rows and 50 columns
- 8. Declaration int x ; ///declaring integer type variable x int x[100] ; ///declaring 1D array of 100 integers int x[100] [50] ; ///declaring 100 1D array each of 50 integers ///i.e. a 2D array of 100 rows and 50 columns datatype arrayName [Max_rows][Max_cols] ; • datatype = any valid C data type. • arrayName = any valid C identifier.
- 9. 2 D Array int a[Max_rows] [Max_cols] ; a[0][0] a[0][1] a[0][2] a[0][3] a[1][0] a[1][1] a[1][2] a[1][3] a[2][0] a[2][1] a[2][2] a[2][3] Col 0 Col 1 Col 2 Col 3 Max_cols-1 Row 0 Row 1 Row 2 Max_rows-1
- 10. Initialization int arr[3][4]={1 , 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}; int arr[3][4]={ {1,2,3,4}, {5,6,7,8}, {9,10,11,12} }; Or, 1 2 3 4 5 6 7 8 9 10 11 12
- 11. Accessing 2D array 1 2 3 4 5 6 7 8 9 10 11 12 Row 1 >>> Col 1 int var=arr[1][1]; /// the value of variable var is 6
- 12. Accessing 2D array 1 2 3 4 5 6 7 8 9 10 11 12 Row 1 >>> Col 1 int var=arr[1][1]; /// the value of variable var is 6 scanf("%d",&arr[2][3]); /// let, input is 100 printf("%d",arr[2][3]); 100
- 13. Accessing 2D array 1 2 3 4 5 6 7 8 9 10 11 12 Row 1 >>> Col 1 int var=arr[1][1]; /// the value of variable var is 6 scanf("%d",&arr[2][3]); /// let, input is 100 arr[0][0] = 20 ; printf("%d",arr[2][3]); 100 20
- 14. Taking Input #include <stdio.h> #define ROW 5 #define COL 3 int main() { int arr[ROW][COL]; int r,c; for(r=0;r<ROW;r++){ for(c=0;c<COL;c++){ scanf("%d", &arr[r][c]); } } printf("Completedn"); ///other codes...... return 0; }
- 15. Showing 2D array int r,c; for(r=0;r<ROW;r++){ for(c=0;c<COL;c++){ printf("%d ",arr[r][c]); } printf("n"); ///showing the next row in a different line }